53139393 has 6 divisors (see below), whose sum is σ = 76756914. Its totient is φ = 35426256.

The previous prime is 53139389. The next prime is 53139431. The reversal of 53139393 is 39393135.

53139393 is a `hidden beast` number, since 531 + 39 + 3 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46621584 + 6517809 = 6828^2 + 2553^2 .

It is not a de Polignac number, because 53139393 - 2² = 53139389 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53139343) 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, 2952180 + ... + 2952197.

It is an arithmetic number, because the mean of its divisors is an integer number (12792819).

Almost surely, 2^53139393 is an apocalyptic number.

It is an amenable number.

53139393 is a deficient number, since it is larger than the sum of its proper divisors (23617521).

53139393 is a wasteful number, since it uses less digits than its factorization.

53139393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5904383 (or 5904380 counting only the distinct ones).

The product of its digits is 32805, while the sum is 36.

The square root of 53139393 is about 7289.6771533450. The cubic root of 53139393 is about 375.9575952820.

It can be divided in two parts, 5313 and 9393, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 53139393 in words is "fifty-three million, one hundred thirty-nine thousand, three hundred ninety-three".