398137720 has 32 divisors (see below), whose sum is σ = 906610320. Its totient is φ = 157335040.

The previous prime is 398137717. The next prime is 398137721. The reversal of 398137720 is 27731893.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398137721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56641 + ... + 63280.

Almost surely, 2^398137720 is an apocalyptic number.

It is an amenable number.

398137720 is an abundant number, since it is smaller than the sum of its proper divisors (508472600).

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

398137720 is a wasteful number, since it uses less digits than its factorization.

398137720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120015 (or 120011 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 398137720 is about 19953.3886846320. The cubic root of 398137720 is about 735.6610709079.

The spelling of 398137720 in words is "three hundred ninety-eight million, one hundred thirty-seven thousand, seven hundred twenty".