400353666 has 16 divisors (see below), whose sum is σ = 800904000. Its totient is φ = 133418448.

The previous prime is 400353649. The next prime is 400353683. The reversal of 400353666 is 666353004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400353649) and next prime (400353683).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40875 + ... + 49713.

It is an arithmetic number, because the mean of its divisors is an integer number (50056500).

Almost surely, 2^400353666 is an apocalyptic number.

400353666 is an abundant number, since it is smaller than the sum of its proper divisors (400550334).

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

400353666 is a wasteful number, since it uses less digits than its factorization.

400353666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16393.

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 400353666 is about 20008.8396964941. The cubic root of 400353666 is about 737.0233885405.

The spelling of 400353666 in words is "four hundred million, three hundred fifty-three thousand, six hundred sixty-six".