400811977 has 4 divisors (see below), whose sum is σ = 401279440. Its totient is φ = 400344516.

The previous prime is 400811963. The next prime is 400812001. The reversal of 400811977 is 779118004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400811977 - 2⁷ = 400811849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400811377) 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 3 ways as a sum of consecutive naturals, for example, 232443 + ... + 234160.

It is an arithmetic number, because the mean of its divisors is an integer number (100319860).

Almost surely, 2^400811977 is an apocalyptic number.

It is an amenable number.

400811977 is a deficient number, since it is larger than the sum of its proper divisors (467463).

400811977 is an equidigital number, since it uses as much as digits as its factorization.

400811977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467462.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 400811977 is about 20020.2891337763. The cubic root of 400811977 is about 737.3045209006.

The spelling of 400811977 in words is "four hundred million, eight hundred eleven thousand, nine hundred seventy-seven".