398159540 has 24 divisors (see below), whose sum is σ = 838041120. Its totient is φ = 158900768.

The previous prime is 398159539. The next prime is 398159557. The reversal of 398159540 is 45951893.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 398159491 and 398159500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13610 + ... + 31329.

It is an arithmetic number, because the mean of its divisors is an integer number (34918380).

Almost surely, 2^398159540 is an apocalyptic number.

It is an amenable number.

398159540 is an abundant number, since it is smaller than the sum of its proper divisors (439881580).

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

398159540 is a wasteful number, since it uses less digits than its factorization.

398159540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45391 (or 45389 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 398159540 is about 19953.9354514341. The cubic root of 398159540 is about 735.6745100024.

The spelling of 398159540 in words is "three hundred ninety-eight million, one hundred fifty-nine thousand, five hundred forty".