400031956 has 6 divisors (see below), whose sum is σ = 700055930. Its totient is φ = 200015976.

The previous prime is 400031923. The next prime is 400031971. The reversal of 400031956 is 659130004.

It can be written as a sum of positive squares in only one way, i.e., 330876100 + 69155856 = 18190^2 + 8316^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50003991 + ... + 50003998.

Almost surely, 2^400031956 is an apocalyptic number.

It is an amenable number.

400031956 is a deficient number, since it is larger than the sum of its proper divisors (300023974).

400031956 is a wasteful number, since it uses less digits than its factorization.

400031956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100007993 (or 100007991 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 400031956 is about 20000.7988840446. The cubic root of 400031956 is about 736.8259203574.

The spelling of 400031956 in words is "four hundred million, thirty-one thousand, nine hundred fifty-six".