400232644 has 96 divisors (see below), whose sum is σ = 870912000. Its totient is φ = 157158144.

The previous prime is 400232639. The next prime is 400232659. The reversal of 400232644 is 446232004.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3740439 + ... + 3740545.

It is an arithmetic number, because the mean of its divisors is an integer number (9072000).

Almost surely, 2^400232644 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 400232644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435456000).

400232644 is an abundant number, since it is smaller than the sum of its proper divisors (470679356).

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

400232644 is a wasteful number, since it uses less digits than its factorization.

400232644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 400232644 is about 20005.8152545704. The cubic root of 400232644 is about 736.9491166811.

Adding to 400232644 its reverse (446232004), we get a palindrome (846464648).

The spelling of 400232644 in words is "four hundred million, two hundred thirty-two thousand, six hundred forty-four".