52420140 has 72 divisors (see below), whose sum is σ = 162908928. Its totient is φ = 13635840.

The previous prime is 52420117. The next prime is 52420153. The reversal of 52420140 is 4102425.

52420140 is a `hidden beast` number, since 524 + 2 + 0 + 140 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3829 + ... + 10931.

It is an arithmetic number, because the mean of its divisors is an integer number (2262624).

Almost surely, 2^52420140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52420140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81454464).

52420140 is an abundant number, since it is smaller than the sum of its proper divisors (110488788).

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

52420140 is a wasteful number, since it uses less digits than its factorization.

52420140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159 (or 7154 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 52420140 is about 7240.1754122397. The cubic root of 52420140 is about 374.2536622654.

Adding to 52420140 its reverse (4102425), we get a palindrome (56522565).

The spelling of 52420140 in words is "fifty-two million, four hundred twenty thousand, one hundred forty".