400552540 has 24 divisors (see below), whose sum is σ = 844144560. Its totient is φ = 159652608.

The previous prime is 400552531. The next prime is 400552561. The reversal of 400552540 is 45255004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29725 + ... + 41044.

It is an arithmetic number, because the mean of its divisors is an integer number (35172690).

Almost surely, 2^400552540 is an apocalyptic number.

It is an amenable number.

400552540 is an abundant number, since it is smaller than the sum of its proper divisors (443592020).

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

400552540 is a wasteful number, since it uses less digits than its factorization.

400552540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71061 (or 71059 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 400552540 is about 20013.8087329723. The cubic root of 400552540 is about 737.1454060952.

The spelling of 400552540 in words is "four hundred million, five hundred fifty-two thousand, five hundred forty".