13897863640 has 16 divisors (see below), whose sum is σ = 31270193280. Its totient is φ = 5559145440.

The previous prime is 13897863631. The next prime is 13897863653. The reversal of 13897863640 is 4636879831.

It is a happy number.

It is a super-2 number, since 2×13897863640² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173723256 + ... + 173723335.

It is an arithmetic number, because the mean of its divisors is an integer number (1954387080).

Almost surely, 2^13897863640 is an apocalyptic number.

13897863640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13897863640 is an abundant number, since it is smaller than the sum of its proper divisors (17372329640).

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

13897863640 is a wasteful number, since it uses less digits than its factorization.

13897863640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347446602 (or 347446598 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 13897863640 in words is "thirteen billion, eight hundred ninety-seven million, eight hundred sixty-three thousand, six hundred forty".