400748544 has 156 divisors (see below), whose sum is σ = 1323796656. Its totient is φ = 114425856.

The previous prime is 400748539. The next prime is 400748561. The reversal of 400748544 is 445847004.

400748544 is a `hidden beast` number, since 40 + 0 + 74 + 8 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 400748499 and 400748508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257272 + ... + 258824.

It is an arithmetic number, because the mean of its divisors is an integer number (8485876).

Almost surely, 2^400748544 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 400748544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (661898328).

400748544 is an abundant number, since it is smaller than the sum of its proper divisors (923048112).

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

400748544 is a wasteful number, since it uses less digits than its factorization.

400748544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 36.

The square root of 400748544 is about 20018.7048532117. The cubic root of 400748544 is about 737.2656232729.

The spelling of 400748544 in words is "four hundred million, seven hundred forty-eight thousand, five hundred forty-four".