400066631 has 4 divisors (see below), whose sum is σ = 407615112. Its totient is φ = 392518152.

The previous prime is 400066621. The next prime is 400066649. The reversal of 400066631 is 136660004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400066631 is a prime.

It is a super-2 number, since 2×400066631² = 320106618479380322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400066631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400066621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3774161 + ... + 3774266.

It is an arithmetic number, because the mean of its divisors is an integer number (101903778).

Almost surely, 2^400066631 is an apocalyptic number.

400066631 is a deficient number, since it is larger than the sum of its proper divisors (7548481).

400066631 is an equidigital number, since it uses as much as digits as its factorization.

400066631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7548480.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 400066631 is about 20001.6657056356. The cubic root of 400066631 is about 736.8472092404.

The spelling of 400066631 in words is "four hundred million, sixty-six thousand, six hundred thirty-one".