400066736 has 20 divisors (see below), whose sum is σ = 815926200. Its totient is φ = 189505152.

The previous prime is 400066697. The next prime is 400066739. The reversal of 400066736 is 637660004.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (400066739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657701 + ... + 658308.

It is an arithmetic number, because the mean of its divisors is an integer number (40796310).

Almost surely, 2^400066736 is an apocalyptic number.

It is an amenable number.

400066736 is an abundant number, since it is smaller than the sum of its proper divisors (415859464).

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

400066736 is a wasteful number, since it uses less digits than its factorization.

400066736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316036 (or 1316030 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 400066736 is about 20001.6683304168. The cubic root of 400066736 is about 736.8472737038.

The spelling of 400066736 in words is "four hundred million, sixty-six thousand, seven hundred thirty-six".