400978398 has 16 divisors (see below), whose sum is σ = 823631760. Its totient is φ = 130046976.

The previous prime is 400978381. The next prime is 400978399. The reversal of 400978398 is 893879004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400978399) by changing a digit.

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, 902883 + ... + 903326.

It is an arithmetic number, because the mean of its divisors is an integer number (51476985).

Almost surely, 2^400978398 is an apocalyptic number.

400978398 is an abundant number, since it is smaller than the sum of its proper divisors (422653362).

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

400978398 is a wasteful number, since it uses less digits than its factorization.

400978398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806251.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 400978398 is about 20024.4450110359. The cubic root of 400978398 is about 737.4065520974.

The spelling of 400978398 in words is "four hundred million, nine hundred seventy-eight thousand, three hundred ninety-eight".