398634440 has 32 divisors (see below), whose sum is σ = 944136000. Its totient is φ = 151061184.

The previous prime is 398634437. The next prime is 398634463. The reversal of 398634440 is 44436893.

It is a super-2 number, since 2×398634440² = 317818833508227200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261500 + ... + 263019.

It is an arithmetic number, because the mean of its divisors is an integer number (29504250).

Almost surely, 2^398634440 is an apocalyptic number.

It is an amenable number.

398634440 is an abundant number, since it is smaller than the sum of its proper divisors (545501560).

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

398634440 is a wasteful number, since it uses less digits than its factorization.

398634440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524549 (or 524545 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 398634440 is about 19965.8318133756. The cubic root of 398634440 is about 735.9668827648.

The spelling of 398634440 in words is "three hundred ninety-eight million, six hundred thirty-four thousand, four hundred forty".