401975540 has 24 divisors (see below), whose sum is σ = 893805192. Its totient is φ = 151331840.

The previous prime is 401975527. The next prime is 401975549. The reversal of 401975540 is 45579104.

It can be written as a sum of positive squares in 4 ways, for example, as 200392336 + 201583204 = 14156^2 + 14198^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 401975540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401975549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590801 + ... + 591480.

It is an arithmetic number, because the mean of its divisors is an integer number (37241883).

Almost surely, 2^401975540 is an apocalyptic number.

It is an amenable number.

401975540 is an abundant number, since it is smaller than the sum of its proper divisors (491829652).

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

401975540 is a wasteful number, since it uses less digits than its factorization.

401975540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182307 (or 1182305 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 401975540 is about 20049.3276695255. The cubic root of 401975540 is about 738.0173001920.

The spelling of 401975540 in words is "four hundred one million, nine hundred seventy-five thousand, five hundred forty".