52423440 has 80 divisors (see below), whose sum is σ = 169596288. Its totient is φ = 13370368.

The previous prime is 52423429. The next prime is 52423457. The reversal of 52423440 is 4432425.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×52423440² = 5496434122867200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 52423440.

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, 772 + ... + 10268.

Almost surely, 2^52423440 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 52423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84798144).

52423440 is an abundant number, since it is smaller than the sum of its proper divisors (117172848).

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

52423440 is a wasteful number, since it uses less digits than its factorization.

52423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9536 (or 9530 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 52423440 is about 7240.4033036841. The cubic root of 52423440 is about 374.2615155521.

Adding to 52423440 its reverse (4432425), we get a palindrome (56855865).

The spelling of 52423440 in words is "fifty-two million, four hundred twenty-three thousand, four hundred forty".