398399832 has 24 divisors (see below), whose sum is σ = 1078999740. Its totient is φ = 132799920.

The previous prime is 398399819. The next prime is 398399839. The reversal of 398399832 is 238993893.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×398399832² = 317444852275256448, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398399839) 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 5 ways as a sum of consecutive naturals, for example, 2766594 + ... + 2766737.

Almost surely, 2^398399832 is an apocalyptic number.

It is an amenable number.

398399832 is an abundant number, since it is smaller than the sum of its proper divisors (680599908).

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

398399832 is a wasteful number, since it uses less digits than its factorization.

398399832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5533343 (or 5533336 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 398399832 is about 19959.9557113737. The cubic root of 398399832 is about 735.8224751031.

The spelling of 398399832 in words is "three hundred ninety-eight million, three hundred ninety-nine thousand, eight hundred thirty-two".