1398365988 has 24 divisors (see below), whose sum is σ = 3263739360. Its totient is φ = 465995520.

The previous prime is 1398365981. The next prime is 1398366001. The reversal of 1398365988 is 8895638931.

It is a super-2 number, since 2×1398365988² = 3910854872790432288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1398365981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37428 + ... + 64788.

It is an arithmetic number, because the mean of its divisors is an integer number (135989140).

Almost surely, 2^1398365988 is an apocalyptic number.

It is an amenable number.

1398365988 is an abundant number, since it is smaller than the sum of its proper divisors (1865373372).

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

1398365988 is a wasteful number, since it uses less digits than its factorization.

1398365988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31627 (or 31625 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 60.

The square root of 1398365988 is about 37394.7320888919. The cubic root of 1398365988 is about 1118.2535461808.

The spelling of 1398365988 in words is "one billion, three hundred ninety-eight million, three hundred sixty-five thousand, nine hundred eighty-eight".