52138242 has 80 divisors (see below), whose sum is σ = 132538560. Its totient is φ = 15186528.

The previous prime is 52138237. The next prime is 52138243. The reversal of 52138242 is 24283125.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (52138243) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39363 + ... + 40665.

It is an arithmetic number, because the mean of its divisors is an integer number (1656732).

Almost surely, 2^52138242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52138242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66269280).

52138242 is an abundant number, since it is smaller than the sum of its proper divisors (80400318).

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

52138242 is a wasteful number, since it uses less digits than its factorization.

52138242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349 (or 1340 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 52138242 is about 7220.6815467794. The cubic root of 52138242 is about 373.5815857000.

The spelling of 52138242 in words is "fifty-two million, one hundred thirty-eight thousand, two hundred forty-two".