1390391628 has 48 divisors (see below), whose sum is σ = 3276733824. Its totient is φ = 458842240.

The previous prime is 1390391621. The next prime is 1390391657. The reversal of 1390391628 is 8261930931.

It is a self number, because there is not a number n which added to its sum of digits gives 1390391628.

It is not an unprimeable number, because it can be changed into a prime (1390391621) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 766843 + ... + 768653.

It is an arithmetic number, because the mean of its divisors is an integer number (68265288).

Almost surely, 2^1390391628 is an apocalyptic number.

It is an amenable number.

1390391628 is an abundant number, since it is smaller than the sum of its proper divisors (1886342196).

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

1390391628 is a wasteful number, since it uses less digits than its factorization.

1390391628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422 (or 2420 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 1390391628 is about 37287.9555352663. The cubic root of 1390391628 is about 1116.1238316619.

The spelling of 1390391628 in words is "one billion, three hundred ninety million, three hundred ninety-one thousand, six hundred twenty-eight".