53249940 has 96 divisors (see below), whose sum is σ = 171064320. Its totient is φ = 13737600.

The previous prime is 53249921. The next prime is 53249983. The reversal of 53249940 is 4994235.

It is a super-2 number, since 2×53249940² = 5671112220007200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 53249895 and 53249904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15150 + ... + 18330.

It is an arithmetic number, because the mean of its divisors is an integer number (1781920).

Almost surely, 2^53249940 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 53249940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85532160).

53249940 is an abundant number, since it is smaller than the sum of its proper divisors (117814380).

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

53249940 is a wasteful number, since it uses less digits than its factorization.

53249940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230 (or 3222 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 53249940 is about 7297.2556485298. The cubic root of 53249940 is about 376.2181188794.

The spelling of 53249940 in words is "fifty-three million, two hundred forty-nine thousand, nine hundred forty".