400646555 has 4 divisors (see below), whose sum is σ = 480775872. Its totient is φ = 320517240.

The previous prime is 400646551. The next prime is 400646563. The reversal of 400646555 is 555646004.

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

It is not a de Polignac number, because 400646555 - 2² = 400646551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400646551) 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, 40064651 + ... + 40064660.

It is an arithmetic number, because the mean of its divisors is an integer number (120193968).

Almost surely, 2^400646555 is an apocalyptic number.

400646555 is a deficient number, since it is larger than the sum of its proper divisors (80129317).

400646555 is an equidigital number, since it uses as much as digits as its factorization.

400646555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80129316.

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 400646555 is about 20016.1573485022. The cubic root of 400646555 is about 737.2030741886.

The spelling of 400646555 in words is "four hundred million, six hundred forty-six thousand, five hundred fifty-five".