400506705806 has 4 divisors (see below), whose sum is σ = 600760058712. Its totient is φ = 200253352902.

The previous prime is 400506705793. The next prime is 400506705857. The reversal of 400506705806 is 608507605004.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 100126676450 + ... + 100126676453.

It is an arithmetic number, because the mean of its divisors is an integer number (150190014678).

Almost surely, 2^400506705806 is an apocalyptic number.

400506705806 is a deficient number, since it is larger than the sum of its proper divisors (200253352906).

400506705806 is a wasteful number, since it uses less digits than its factorization.

400506705806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200253352905.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 400506705806 in words is "four hundred billion, five hundred six million, seven hundred five thousand, eight hundred six".