400953987 has 12 divisors (see below), whose sum is σ = 661892400. Its totient is φ = 229116528.

The previous prime is 400953983. The next prime is 400953997. The reversal of 400953987 is 789359004.

It is not a de Polignac number, because 400953987 - 2² = 400953983 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (400953983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3182112 + ... + 3182237.

It is an arithmetic number, because the mean of its divisors is an integer number (55157700).

Almost surely, 2^400953987 is an apocalyptic number.

400953987 is a deficient number, since it is larger than the sum of its proper divisors (260938413).

400953987 is a wasteful number, since it uses less digits than its factorization.

400953987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6364362 (or 6364359 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 400953987 is about 20023.8354717572. The cubic root of 400953987 is about 737.3915877030.

The spelling of 400953987 in words is "four hundred million, nine hundred fifty-three thousand, nine hundred eighty-seven".