400836128 has 48 divisors (see below), whose sum is σ = 983876544. Its totient is φ = 156168960.

The previous prime is 400836127. The next prime is 400836167. The reversal of 400836128 is 821638004.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 400836094 and 400836103.

It is not an unprimeable number, because it can be changed into a prime (400836127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78875 + ... + 83802.

It is an arithmetic number, because the mean of its divisors is an integer number (20497428).

Almost surely, 2^400836128 is an apocalyptic number.

It is an amenable number.

400836128 is an abundant number, since it is smaller than the sum of its proper divisors (583040416).

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

400836128 is a wasteful number, since it uses less digits than its factorization.

400836128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162705 (or 162697 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 400836128 is about 20020.8922878078. The cubic root of 400836128 is about 737.3193294100.

The spelling of 400836128 in words is "four hundred million, eight hundred thirty-six thousand, one hundred twenty-eight".