52212540 has 48 divisors (see below), whose sum is σ = 146649888. Its totient is φ = 13880064.

The previous prime is 52212521. The next prime is 52212571. The reversal of 52212540 is 4521225.

It is a happy number.

It is a super-2 number, since 2×52212540² = 5452298666503200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21214 + ... + 23546.

It is an arithmetic number, because the mean of its divisors is an integer number (3055206).

Almost surely, 2^52212540 is an apocalyptic number.

It is an amenable number.

52212540 is an abundant number, since it is smaller than the sum of its proper divisors (94437348).

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

52212540 is a wasteful number, since it uses less digits than its factorization.

52212540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718 (or 2716 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 52212540 is about 7225.8245204267. The cubic root of 52212540 is about 373.7589551290.

Adding to 52212540 its reverse (4521225), we get a palindrome (56733765).

The spelling of 52212540 in words is "fifty-two million, two hundred twelve thousand, five hundred forty".