401656 has 8 divisors (see below), whose sum is σ = 753120. Its totient is φ = 200824.

The previous prime is 401651. The next prime is 401669. The reversal of 401656 is 656104.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×401656² = 322655084672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25096 + ... + 25111.

It is an arithmetic number, because the mean of its divisors is an integer number (94140).

2⁴⁰¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

401656 is a deficient number, since it is larger than the sum of its proper divisors (351464).

401656 is a wasteful number, since it uses less digits than its factorization.

401656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50213 (or 50209 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 401656 is about 633.7633627783. The cubic root of 401656 is about 73.7821692466.

The spelling of 401656 in words is "four hundred one thousand, six hundred fifty-six".