398432440 has 32 divisors (see below), whose sum is σ = 1024541280. Its totient is φ = 136605312.

The previous prime is 398432423. The next prime is 398432459. The reversal of 398432440 is 44234893.

It is a self number, because there is not a number n which added to its sum of digits gives 398432440.

It is a congruent number.

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, 711207 + ... + 711766.

It is an arithmetic number, because the mean of its divisors is an integer number (32016915).

Almost surely, 2^398432440 is an apocalyptic number.

It is an amenable number.

398432440 is an abundant number, since it is smaller than the sum of its proper divisors (626108840).

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

398432440 is a wasteful number, since it uses less digits than its factorization.

398432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422991 (or 1422987 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 398432440 is about 19960.7725301402. The cubic root of 398432440 is about 735.8425496134.

The spelling of 398432440 in words is "three hundred ninety-eight million, four hundred thirty-two thousand, four hundred forty".