400731444 has 36 divisors (see below), whose sum is σ = 1023411844. Its totient is φ = 132198912.

The previous prime is 400731433. The next prime is 400731449. The reversal of 400731444 is 444137004.

It can be written as a sum of positive squares in 2 ways, for example, as 209960100 + 190771344 = 14490^2 + 13812^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400731449) 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, 53887 + ... + 60870.

Almost surely, 2^400731444 is an apocalyptic number.

It is an amenable number.

400731444 is an abundant number, since it is smaller than the sum of its proper divisors (622680400).

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

400731444 is a wasteful number, since it uses less digits than its factorization.

400731444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114864 (or 114859 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 400731444 is about 20018.2777480981. The cubic root of 400731444 is about 737.2551367125.

Adding to 400731444 its reverse (444137004), we get a palindrome (844868448).

The spelling of 400731444 in words is "four hundred million, seven hundred thirty-one thousand, four hundred forty-four".