25530993 has 6 divisors (see below), whose sum is σ = 36878114. Its totient is φ = 17020656.

The previous prime is 25530977. The next prime is 25530997. The reversal of 25530993 is 39903552.

It can be written as a sum of positive squares in only one way, i.e., 21233664 + 4297329 = 4608^2 + 2073^2 .

It is not a de Polignac number, because 25530993 - 2⁴ = 25530977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25530997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1418380 + ... + 1418397.

Almost surely, 2^25530993 is an apocalyptic number.

It is an amenable number.

25530993 is a deficient number, since it is larger than the sum of its proper divisors (11347121).

25530993 is a wasteful number, since it uses less digits than its factorization.

25530993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2836783 (or 2836780 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 36.

The square root of 25530993 is about 5052.8203015742. The cubic root of 25530993 is about 294.4574649622.

The spelling of 25530993 in words is "twenty-five million, five hundred thirty thousand, nine hundred ninety-three".