1386828397 has 4 divisors (see below), whose sum is σ = 1468406556. Its totient is φ = 1305250240.

The previous prime is 1386828383. The next prime is 1386828419. The reversal of 1386828397 is 7938286831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 706974921 + 679853476 = 26589^2 + 26074^2 .

It is a cyclic number.

It is not a de Polignac number, because 1386828397 - 2¹¹ = 1386826349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386828337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40789054 + ... + 40789087.

It is an arithmetic number, because the mean of its divisors is an integer number (367101639).

Almost surely, 2^1386828397 is an apocalyptic number.

1386828397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1386828397 is a deficient number, since it is larger than the sum of its proper divisors (81578159).

1386828397 is an equidigital number, since it uses as much as digits as its factorization.

1386828397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81578158.

The product of its digits is 3483648, while the sum is 55.

The square root of 1386828397 is about 37240.1449648091. The cubic root of 1386828397 is about 1115.1695659321.

The spelling of 1386828397 in words is "one billion, three hundred eighty-six million, eight hundred twenty-eight thousand, three hundred ninety-seven".