401366646 has 24 divisors (see below), whose sum is σ = 870054120. Its totient is φ = 133723296.

The previous prime is 401366599. The next prime is 401366683. The reversal of 401366646 is 646663104.

It is a super-2 number, since 2×401366646² = 322190369042578632, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 401366646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44725 + ... + 52943.

It is an arithmetic number, because the mean of its divisors is an integer number (36252255).

Almost surely, 2^401366646 is an apocalyptic number.

401366646 is an abundant number, since it is smaller than the sum of its proper divisors (468687474).

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

401366646 is a wasteful number, since it uses less digits than its factorization.

401366646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10940 (or 10937 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 401366646 is about 20034.1370166024. The cubic root of 401366646 is about 737.6444736976.

The spelling of 401366646 in words is "four hundred one million, three hundred sixty-six thousand, six hundred forty-six".