400538976 has 48 divisors (see below), whose sum is σ = 1058416128. Its totient is φ = 132624000.

The previous prime is 400538939. The next prime is 400538987. The reversal of 400538976 is 679835004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

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, 681 + ... + 28311.

It is an arithmetic number, because the mean of its divisors is an integer number (22050336).

Almost surely, 2^400538976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400538976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (529208064).

400538976 is an abundant number, since it is smaller than the sum of its proper divisors (657877152).

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

400538976 is a wasteful number, since it uses less digits than its factorization.

400538976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27795 (or 27787 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 400538976 is about 20013.4698640690. The cubic root of 400538976 is about 737.1370852948.

The spelling of 400538976 in words is "four hundred million, five hundred thirty-eight thousand, nine hundred seventy-six".