53439993 has 30 divisors (see below), whose sum is σ = 84957246. Its totient is φ = 33360768.

The previous prime is 53439983. The next prime is 53440003. The reversal of 53439993 is 39993435.

It is an interprime number because it is at equal distance from previous prime (53439983) and next prime (53440003).

It can be written as a sum of positive squares in 3 ways, for example, as 45805824 + 7634169 = 6768^2 + 2763^2 .

It is not a de Polignac number, because 53439993 - 2⁶ = 53439929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53439983) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 271171 + ... + 271367.

Almost surely, 2^53439993 is an apocalyptic number.

It is an amenable number.

53439993 is a deficient number, since it is larger than the sum of its proper divisors (31517253).

53439993 is an equidigital number, since it uses as much as digits as its factorization.

53439993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 217 counting only the distinct ones).

The product of its digits is 393660, while the sum is 45.

The square root of 53439993 is about 7310.2662742201. The cubic root of 53439993 is about 376.6651709376.

The spelling of 53439993 in words is "fifty-three million, four hundred thirty-nine thousand, nine hundred ninety-three".