398921040 has 120 divisors (see below), whose sum is σ = 1531116288. Its totient is φ = 91180800.

The previous prime is 398921027. The next prime is 398921041. The reversal of 398921040 is 40129893.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 398920986 and 398921004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398921041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34536 + ... + 44615.

Almost surely, 2^398921040 is an apocalyptic number.

398921040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

398921040 is an abundant number, since it is smaller than the sum of its proper divisors (1132195248).

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

398921040 is a wasteful number, since it uses less digits than its factorization.

398921040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79177 (or 79168 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 398921040 is about 19973.0077855089. The cubic root of 398921040 is about 736.1432160653.

The spelling of 398921040 in words is "three hundred ninety-eight million, nine hundred twenty-one thousand, forty".