400709916 has 36 divisors (see below), whose sum is σ = 1050423192. Its totient is φ = 133569648.

The previous prime is 400709863. The next prime is 400709917. The reversal of 400709916 is 619907004.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400709917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205155 + ... + 207098.

It is an arithmetic number, because the mean of its divisors is an integer number (29178422).

Almost surely, 2^400709916 is an apocalyptic number.

It is an amenable number.

400709916 is an abundant number, since it is smaller than the sum of its proper divisors (649713276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400709916 is a wasteful number, since it uses less digits than its factorization.

400709916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412272 (or 412258 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 400709916 is about 20017.7400322814. The cubic root of 400709916 is about 737.2419342606.

The spelling of 400709916 in words is "four hundred million, seven hundred nine thousand, nine hundred sixteen".