400031247 has 24 divisors (see below), whose sum is σ = 676864512. Its totient is φ = 207807600.

The previous prime is 400031231. The next prime is 400031257. The reversal of 400031247 is 742130004.

It is not a de Polignac number, because 400031247 - 2⁴ = 400031231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400031207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122079 + ... + 125312.

It is an arithmetic number, because the mean of its divisors is an integer number (28202688).

Almost surely, 2^400031247 is an apocalyptic number.

400031247 is a deficient number, since it is larger than the sum of its proper divisors (276833265).

400031247 is a wasteful number, since it uses less digits than its factorization.

400031247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247419 (or 247412 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 400031247 is about 20000.7811597447. The cubic root of 400031247 is about 736.8254850506.

The spelling of 400031247 in words is "four hundred million, thirty-one thousand, two hundred forty-seven".