401515540 has 12 divisors (see below), whose sum is σ = 843182676. Its totient is φ = 160606208.

The previous prime is 401515483. The next prime is 401515567. The reversal of 401515540 is 45515104.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 80245764 + 321269776 = 8958^2 + 17924^2 .

It is a super-2 number, since 2×401515540² = 322429457722983200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10037869 + ... + 10037908.

It is an arithmetic number, because the mean of its divisors is an integer number (70265223).

Almost surely, 2^401515540 is an apocalyptic number.

It is an amenable number.

401515540 is an abundant number, since it is smaller than the sum of its proper divisors (441667136).

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

401515540 is a wasteful number, since it uses less digits than its factorization.

401515540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20075786 (or 20075784 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 401515540 is about 20037.8526793666. The cubic root of 401515540 is about 737.7356764744.

The spelling of 401515540 in words is "four hundred one million, five hundred fifteen thousand, five hundred forty".