400338686 has 16 divisors (see below), whose sum is σ = 670336128. Its totient is φ = 177739800.

The previous prime is 400338629. The next prime is 400338689. The reversal of 400338686 is 686833004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400338689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210650 + ... + 212541.

It is an arithmetic number, because the mean of its divisors is an integer number (41896008).

Almost surely, 2^400338686 is an apocalyptic number.

400338686 is a deficient number, since it is larger than the sum of its proper divisors (269997442).

400338686 is a wasteful number, since it uses less digits than its factorization.

400338686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423247.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 400338686 is about 20008.4653584427. The cubic root of 400338686 is about 737.0141960448.

The spelling of 400338686 in words is "four hundred million, three hundred thirty-eight thousand, six hundred eighty-six".