404431144 has 16 divisors (see below), whose sum is σ = 816640020. Its totient is φ = 186660480.

The previous prime is 404431141. The next prime is 404431171. The reversal of 404431144 is 441134404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 404412100 + 19044 = 20110^2 + 138^2 .

It is not an unprimeable number, because it can be changed into a prime (404431141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1944277 + ... + 1944484.

Almost surely, 2^404431144 is an apocalyptic number.

It is an amenable number.

404431144 is an abundant number, since it is smaller than the sum of its proper divisors (412208876).

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

404431144 is a wasteful number, since it uses less digits than its factorization.

404431144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888780 (or 3888776 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 404431144 is about 20110.4734901991. The cubic root of 404431144 is about 739.5170601047.

Adding to 404431144 its reverse (441134404), we get a palindrome (845565548).

The spelling of 404431144 in words is "four hundred four million, four hundred thirty-one thousand, one hundred forty-four".