400425636 has 72 divisors (see below), whose sum is σ = 1040092032. Its totient is φ = 119188800.

The previous prime is 400425631. The next prime is 400425643. The reversal of 400425636 is 636524004.

It is not an unprimeable number, because it can be changed into a prime (400425631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148581 + ... + 151251.

Almost surely, 2^400425636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400425636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (520046016).

400425636 is an abundant number, since it is smaller than the sum of its proper divisors (639666396).

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

400425636 is a wasteful number, since it uses less digits than its factorization.

400425636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753 (or 2720 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 400425636 is about 20010.6380707862. The cubic root of 400425636 is about 737.0675498239.

The spelling of 400425636 in words is "four hundred million, four hundred twenty-five thousand, six hundred thirty-six".