400256705 has 8 divisors (see below), whose sum is σ = 480766272. Its totient is φ = 319899888.

The previous prime is 400256699. The next prime is 400256723. The reversal of 400256705 is 507652004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400256705 - 2¹² = 400252609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32339 + ... + 42968.

It is an arithmetic number, because the mean of its divisors is an integer number (60095784).

Almost surely, 2^400256705 is an apocalyptic number.

It is an amenable number.

400256705 is a deficient number, since it is larger than the sum of its proper divisors (80509567).

400256705 is a wasteful number, since it uses less digits than its factorization.

400256705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76375.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 400256705 is about 20006.4165956825. The cubic root of 400256705 is about 736.9638842399.

The spelling of 400256705 in words is "four hundred million, two hundred fifty-six thousand, seven hundred five".