400521365877 has 4 divisors (see below), whose sum is σ = 534028487840. Its totient is φ = 267014243916.

The previous prime is 400521365857. The next prime is 400521365879. The reversal of 400521365877 is 778563125004.

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 not a de Polignac number, because 400521365877 - 2²² = 400517171573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400521365879) 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, 66753560977 + ... + 66753560982.

It is an arithmetic number, because the mean of its divisors is an integer number (133507121960).

Almost surely, 2^400521365877 is an apocalyptic number.

It is an amenable number.

400521365877 is a deficient number, since it is larger than the sum of its proper divisors (133507121963).

400521365877 is a wasteful number, since it uses less digits than its factorization.

400521365877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133507121962.

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 400521365877 in words is "four hundred billion, five hundred twenty-one million, three hundred sixty-five thousand, eight hundred seventy-seven".