400636434 has 48 divisors (see below), whose sum is σ = 891332064. Its totient is φ = 119059200.

The previous prime is 400636429. The next prime is 400636499. The reversal of 400636434 is 434636004.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184314 + ... + 186474.

It is an arithmetic number, because the mean of its divisors is an integer number (18569418).

Almost surely, 2^400636434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400636434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (445666032).

400636434 is an abundant number, since it is smaller than the sum of its proper divisors (490695630).

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

400636434 is a wasteful number, since it uses less digits than its factorization.

400636434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283 (or 2230 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 400636434 is about 20015.9045261512. The cubic root of 400636434 is about 737.1968664768.

The spelling of 400636434 in words is "four hundred million, six hundred thirty-six thousand, four hundred thirty-four".