53121940 has 24 divisors (see below), whose sum is σ = 118118952. Its totient is φ = 19998720.

The previous prime is 53121919. The next prime is 53121949. The reversal of 53121940 is 4912135.

It can be written as a sum of positive squares in 4 ways, for example, as 327184 + 52794756 = 572^2 + 7266^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53121949) 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, 77781 + ... + 78460.

It is an arithmetic number, because the mean of its divisors is an integer number (4921623).

Almost surely, 2^53121940 is an apocalyptic number.

It is an amenable number.

53121940 is an abundant number, since it is smaller than the sum of its proper divisors (64997012).

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

53121940 is a wasteful number, since it uses less digits than its factorization.

53121940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156267 (or 156265 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 53121940 is about 7288.4799512656. The cubic root of 53121940 is about 375.9164311786.

The spelling of 53121940 in words is "fifty-three million, one hundred twenty-one thousand, nine hundred forty".