400626 has 20 divisors (see below), whose sum is σ = 898062. Its totient is φ = 133488.

The previous prime is 400619. The next prime is 400643. The reversal of 400626 is 626004.

400626 is a `hidden beast` number, since 40 + 0 + 626 = 666.

It can be written as a sum of positive squares in only one way, i.e., 301401 + 99225 = 549^2 + 315^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 400599 and 400608.

It is an unprimeable number.

400626 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1075 + ... + 1398.

2⁴⁰⁰⁶²⁶ is an apocalyptic number.

400626 is an abundant number, since it is smaller than the sum of its proper divisors (497436).

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

400626 is a wasteful number, since it uses less digits than its factorization.

400626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487 (or 2478 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 400626 is about 632.9502350106. The cubic root of 400626 is about 73.7190466677.

The spelling of 400626 in words is "four hundred thousand, six hundred twenty-six".