400688686 has 4 divisors (see below), whose sum is σ = 601033032. Its totient is φ = 200344342.

The previous prime is 400688669. The next prime is 400688693. The reversal of 400688686 is 686886004.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 100172170 + ... + 100172173.

It is an arithmetic number, because the mean of its divisors is an integer number (150258258).

Almost surely, 2^400688686 is an apocalyptic number.

400688686 is a deficient number, since it is larger than the sum of its proper divisors (200344346).

400688686 is a wasteful number, since it uses less digits than its factorization.

400688686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200344345.

The product of its (nonzero) digits is 442368, while the sum is 46.

The square root of 400688686 is about 20017.2097456164. The cubic root of 400688686 is about 737.2289140997.

The spelling of 400688686 in words is "four hundred million, six hundred eighty-eight thousand, six hundred eighty-six".