398927440 has 40 divisors (see below), whose sum is σ = 982068840. Its totient is φ = 150183936.

The previous prime is 398927317. The next prime is 398927443. The reversal of 398927440 is 44729893.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10679824 + 388247616 = 3268^2 + 19704^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398927443) 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, 145305 + ... + 148024.

It is an arithmetic number, because the mean of its divisors is an integer number (24551721).

Almost surely, 2^398927440 is an apocalyptic number.

It is an amenable number.

398927440 is an abundant number, since it is smaller than the sum of its proper divisors (583141400).

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

398927440 is a wasteful number, since it uses less digits than its factorization.

398927440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293359 (or 293353 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 398927440 is about 19973.1680010959. The cubic root of 398927440 is about 736.1471527603.

The spelling of 398927440 in words is "three hundred ninety-eight million, nine hundred twenty-seven thousand, four hundred forty".