400031541 has 60 divisors (see below), whose sum is σ = 748710732. Its totient is φ = 210978432.

The previous prime is 400031521. The next prime is 400031543. The reversal of 400031541 is 145130004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 264192516 + 135839025 = 16254^2 + 11655^2 .

It is not a de Polignac number, because 400031541 - 2⁵ = 400031509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400031543) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 47721 + ... + 55473.

Almost surely, 2^400031541 is an apocalyptic number.

It is an amenable number.

400031541 is a deficient number, since it is larger than the sum of its proper divisors (348679191).

400031541 is a wasteful number, since it uses less digits than its factorization.

400031541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7792 (or 7776 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 400031541 is about 20000.7885094563. The cubic root of 400031541 is about 736.8256655587.

Adding to 400031541 its reverse (145130004), we get a palindrome (545161545).

The spelling of 400031541 in words is "four hundred million, thirty-one thousand, five hundred forty-one".