52142240 has 24 divisors (see below), whose sum is σ = 123186420. Its totient is φ = 20856832.

The previous prime is 52142239. The next prime is 52142249. The reversal of 52142240 is 4224125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42876304 + 9265936 = 6548^2 + 3044^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (52142249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162785 + ... + 163104.

Almost surely, 2^52142240 is an apocalyptic number.

It is an amenable number.

52142240 is an abundant number, since it is smaller than the sum of its proper divisors (71044180).

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

52142240 is a wasteful number, since it uses less digits than its factorization.

52142240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325904 (or 325896 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 52142240 is about 7220.9583851453. The cubic root of 52142240 is about 373.5911342959.

Adding to 52142240 its reverse (4224125), we get a palindrome (56366365).

The spelling of 52142240 in words is "fifty-two million, one hundred forty-two thousand, two hundred forty".