400504384 has 84 divisors (see below), whose sum is σ = 941571904. Its totient is φ = 165570048.

The previous prime is 400504333. The next prime is 400504387. The reversal of 400504384 is 483405004.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (400504387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 376237 + ... + 377299.

Almost surely, 2^400504384 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 400504384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (470785952).

400504384 is an abundant number, since it is smaller than the sum of its proper divisors (541067520).

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

400504384 is a wasteful number, since it uses less digits than its factorization.

400504384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1101 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 400504384 is about 20012.6056274539. The cubic root of 400504384 is about 737.1158640723.

Adding to 400504384 its reverse (483405004), we get a palindrome (883909388).

The spelling of 400504384 in words is "four hundred million, five hundred four thousand, three hundred eighty-four".