400000398 has 16 divisors (see below), whose sum is σ = 914286720. Its totient is φ = 114285816.

The previous prime is 400000373. The next prime is 400000411. The reversal of 400000398 is 893000004.

It is a congruent number.

It is an unprimeable number.

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, 4761868 + ... + 4761951.

It is an arithmetic number, because the mean of its divisors is an integer number (57142920).

Almost surely, 2^400000398 is an apocalyptic number.

400000398 is an abundant number, since it is smaller than the sum of its proper divisors (514286322).

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

400000398 is a wasteful number, since it uses less digits than its factorization.

400000398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9523831.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 400000398 is about 20000.0099499975. The cubic root of 400000398 is about 736.8065441021.

The spelling of 400000398 in words is "four hundred million, three hundred ninety-eight", and thus it is an aban number.