401687 has 12 divisors (see below), whose sum is σ = 480984. Its totient is φ = 330720.

The previous prime is 401671. The next prime is 401689. The reversal of 401687 is 786104.

It is not a de Polignac number, because 401687 - 2⁴ = 401671 is a prime.

It is a super-2 number, since 2×401687² = 322704891938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 401687.

It is not an unprimeable number, because it can be changed into a prime (401689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7553 + ... + 7605.

It is an arithmetic number, because the mean of its divisors is an integer number (40082).

2⁴⁰¹⁶⁸⁷ is an apocalyptic number.

401687 is a deficient number, since it is larger than the sum of its proper divisors (79297).

401687 is a wasteful number, since it uses less digits than its factorization.

401687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 401687 is about 633.7878193844. The cubic root of 401687 is about 73.7840673787.

The spelling of 401687 in words is "four hundred one thousand, six hundred eighty-seven".