401636 has 24 divisors (see below), whose sum is σ = 752640. Its totient is φ = 187200.

The previous prime is 401629. The next prime is 401651. The reversal of 401636 is 636104.

It is a super-2 number, since 2×401636² = 322622952992, which contains 22 as substring.

It is an unprimeable number.

401636 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5045 + ... + 5123.

It is an arithmetic number, because the mean of its divisors is an integer number (31360).

2⁴⁰¹⁶³⁶ is an apocalyptic number.

It is an amenable number.

401636 is a deficient number, since it is larger than the sum of its proper divisors (351004).

401636 is a wasteful number, since it uses less digits than its factorization.

401636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 401636 is about 633.7475838218. The cubic root of 401636 is about 73.7809445935.

The spelling of 401636 in words is "four hundred one thousand, six hundred thirty-six".