52212440 has 96 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 16837632.

The previous prime is 52212427. The next prime is 52212487. The reversal of 52212440 is 4421225.

It is a happy number.

52212440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×52212440² = 5452277781507200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32537 + ... + 34103.

It is an arithmetic number, because the mean of its divisors is an integer number (1508220).

Almost surely, 2^52212440 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 52212440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72394560).

52212440 is an abundant number, since it is smaller than the sum of its proper divisors (92576680).

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

52212440 is a wasteful number, since it uses less digits than its factorization.

52212440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609 (or 1598 counting only the distinct ones).

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

The square root of 52212440 is about 7225.8176007979. The cubic root of 52212440 is about 373.7587165150.

Adding to 52212440 its reverse (4421225), we get a palindrome (56633665).

The spelling of 52212440 in words is "fifty-two million, two hundred twelve thousand, four hundred forty".