400818156 has 12 divisors (see below), whose sum is σ = 935242392. Its totient is φ = 133606048.

The previous prime is 400818149. The next prime is 400818157. The reversal of 400818156 is 651818004.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (400818157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16700745 + ... + 16700768.

It is an arithmetic number, because the mean of its divisors is an integer number (77936866).

Almost surely, 2^400818156 is an apocalyptic number.

It is an amenable number.

400818156 is an abundant number, since it is smaller than the sum of its proper divisors (534424236).

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

400818156 is a wasteful number, since it uses less digits than its factorization.

400818156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33401520 (or 33401518 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 400818156 is about 20020.4434516321. The cubic root of 400818156 is about 737.3083096939.

The spelling of 400818156 in words is "four hundred million, eight hundred eighteen thousand, one hundred fifty-six".