401440664 has 48 divisors (see below), whose sum is σ = 799185600. Its totient is φ = 189013824.

The previous prime is 401440657. The next prime is 401440687. The reversal of 401440664 is 466044104.

It is a super-2 number, since 2×401440664² = 322309213425521792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 661049 + ... + 661655.

It is an arithmetic number, because the mean of its divisors is an integer number (16649700).

Almost surely, 2^401440664 is an apocalyptic number.

It is an amenable number.

401440664 is a deficient number, since it is larger than the sum of its proper divisors (397744936).

401440664 is a wasteful number, since it uses less digits than its factorization.

401440664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 401440664 is about 20035.9842283827. The cubic root of 401440664 is about 737.6898151273.

Adding to 401440664 its reverse (466044104), we get a palindrome (867484768).

The spelling of 401440664 in words is "four hundred one million, four hundred forty thousand, six hundred sixty-four".