53388709 has 6 divisors (see below), whose sum is σ = 58683590. Its totient is φ = 48535080.

The previous prime is 53388707. The next prime is 53388761. The reversal of 53388709 is 90788335.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30492484 + 22896225 = 5522^2 + 4785^2 .

It is not a de Polignac number, because 53388709 - 2¹ = 53388707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53388707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220494 + ... + 220735.

Almost surely, 2^53388709 is an apocalyptic number.

It is an amenable number.

53388709 is a deficient number, since it is larger than the sum of its proper divisors (5294881).

53388709 is a wasteful number, since it uses less digits than its factorization.

53388709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441251 (or 441240 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 53388709 is about 7306.7577625100. The cubic root of 53388709 is about 376.5446427337.

The spelling of 53388709 in words is "fifty-three million, three hundred eighty-eight thousand, seven hundred nine".