400401023555 has 64 divisors (see below), whose sum is σ = 526968422400. Its totient is φ = 290303709696.

The previous prime is 400401023549. The next prime is 400401023567. The reversal of 400401023555 is 555320104004.

It is not a de Polignac number, because 400401023555 - 2⁸ = 400401023299 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 366331589 + ... + 366332681.

It is an arithmetic number, because the mean of its divisors is an integer number (8233881600).

Almost surely, 2^400401023555 is an apocalyptic number.

400401023555 is a deficient number, since it is larger than the sum of its proper divisors (126567398845).

400401023555 is a wasteful number, since it uses less digits than its factorization.

400401023555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 400401023555 its reverse (555320104004), we get a palindrome (955721127559).

The spelling of 400401023555 in words is "four hundred billion, four hundred one million, twenty-three thousand, five hundred fifty-five".