401661696 has 72 divisors (see below), whose sum is σ = 1115533440. Its totient is φ = 128060416.

The previous prime is 401661679. The next prime is 401661763. The reversal of 401661696 is 696166104.

It is a super-2 number, since 2×401661696² = 322664236067192832, 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 7 ways as a sum of consecutive naturals, for example, 6295 + ... + 29033.

It is an arithmetic number, because the mean of its divisors is an integer number (15493520).

Almost surely, 2^401661696 is an apocalyptic number.

401661696 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401661696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (557766720).

401661696 is an abundant number, since it is smaller than the sum of its proper divisors (713871744).

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

401661696 is a wasteful number, since it uses less digits than its factorization.

401661696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22781 (or 22767 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 401661696 is about 20041.4993451089. The cubic root of 401661696 is about 737.8251802040.

The spelling of 401661696 in words is "four hundred one million, six hundred sixty-one thousand, six hundred ninety-six".