1390736628 has 84 divisors (see below), whose sum is σ = 3660085380. Its totient is φ = 462174336.

The previous prime is 1390736617. The next prime is 1390736639. The reversal of 1390736628 is 8266370931.

1390736628 is a `hidden beast` number, since 13 + 9 + 0 + 7 + 3 + 6 + 628 = 666.

It is an interprime number because it is at equal distance from previous prime (1390736617) and next prime (1390736639).

It can be written as a sum of positive squares in 2 ways, for example, as 546717924 + 844018704 = 23382^2 + 29052^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1483776 + ... + 1484712.

It is an arithmetic number, because the mean of its divisors is an integer number (43572445).

Almost surely, 2^1390736628 is an apocalyptic number.

1390736628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1390736628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1830042690).

1390736628 is an abundant number, since it is smaller than the sum of its proper divisors (2269348752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1390736628 is an equidigital number, since it uses as much as digits as its factorization.

1390736628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1390736628 is about 37292.5814070305. The cubic root of 1390736628 is about 1116.2161391983.

The spelling of 1390736628 in words is "one billion, three hundred ninety million, seven hundred thirty-six thousand, six hundred twenty-eight".