400403997 has 24 divisors (see below), whose sum is σ = 661829376. Its totient is φ = 228509856.

The previous prime is 400403963. The next prime is 400404007. The reversal of 400403997 is 799304004.

It is not a de Polignac number, because 400403997 - 2⁶ = 400403933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400403197) 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 23 ways as a sum of consecutive naturals, for example, 51628 + ... + 58874.

It is an arithmetic number, because the mean of its divisors is an integer number (27576224).

Almost surely, 2^400403997 is an apocalyptic number.

It is an amenable number.

400403997 is a deficient number, since it is larger than the sum of its proper divisors (261425379).

400403997 is a wasteful number, since it uses less digits than its factorization.

400403997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8137 (or 8134 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 400403997 is about 20010.0973760749. The cubic root of 400403997 is about 737.0542725421.

The spelling of 400403997 in words is "four hundred million, four hundred three thousand, nine hundred ninety-seven".