400136 has 16 divisors (see below), whose sum is σ = 818640. Its totient is φ = 181840.

The previous prime is 400123. The next prime is 400151. The reversal of 400136 is 631004.

It is a self number, because there is not a number n which added to its sum of digits gives 400136.

It is an unprimeable number.

400136 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 3 ways as a sum of consecutive naturals, for example, 2186 + ... + 2361.

It is an arithmetic number, because the mean of its divisors is an integer number (51165).

2⁴⁰⁰¹³⁶ is an apocalyptic number.

It is an amenable number.

400136 is an abundant number, since it is smaller than the sum of its proper divisors (418504).

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

400136 is a wasteful number, since it uses less digits than its factorization.

400136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564 (or 4560 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 400136 is about 632.5630403367. The cubic root of 400136 is about 73.6889794980.

The spelling of 400136 in words is "four hundred thousand, one hundred thirty-six".