400427951 has 12 divisors (see below), whose sum is σ = 508150440. Its totient is φ = 312021360.

The previous prime is 400427947. The next prime is 400427957. The reversal of 400427951 is 159724004.

It is a happy number.

It is not a de Polignac number, because 400427951 - 2² = 400427947 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400427957) 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 11 ways as a sum of consecutive naturals, for example, 370916 + ... + 371993.

It is an arithmetic number, because the mean of its divisors is an integer number (42345870).

Almost surely, 2^400427951 is an apocalyptic number.

400427951 is a deficient number, since it is larger than the sum of its proper divisors (107722489).

400427951 is a wasteful number, since it uses less digits than its factorization.

400427951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742934 (or 742927 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 400427951 is about 20010.6959149351. The cubic root of 400427951 is about 737.0689702359.

The spelling of 400427951 in words is "four hundred million, four hundred twenty-seven thousand, nine hundred fifty-one".