1397815438 has 12 divisors (see below), whose sum is σ = 2142290232. Its totient is φ = 684035180.

The previous prime is 1397815403. The next prime is 1397815459. The reversal of 1397815438 is 8345187931.

It is a happy number.

It is a super-2 number, since 2×1397815438² = 3907775997422263688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1397815391 and 1397815400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 153778 + ... + 162613.

It is an arithmetic number, because the mean of its divisors is an integer number (178524186).

Almost surely, 2^1397815438 is an apocalyptic number.

1397815438 is a deficient number, since it is larger than the sum of its proper divisors (744474794).

1397815438 is an equidigital number, since it uses as much as digits as its factorization.

1397815438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316487 (or 316440 counting only the distinct ones).

The product of its digits is 725760, while the sum is 49.

The square root of 1397815438 is about 37387.3700332077. The cubic root of 1397815438 is about 1118.1067712285.

The spelling of 1397815438 in words is "one billion, three hundred ninety-seven million, eight hundred fifteen thousand, four hundred thirty-eight".