25130639 has 4 divisors (see below), whose sum is σ = 25604856. Its totient is φ = 24656424.

The previous prime is 25130629. The next prime is 25130653. The reversal of 25130639 is 93603152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25130639 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 (25130629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237029 + ... + 237134.

It is an arithmetic number, because the mean of its divisors is an integer number (6401214).

Almost surely, 2^25130639 is an apocalyptic number.

25130639 is a deficient number, since it is larger than the sum of its proper divisors (474217).

25130639 is an equidigital number, since it uses as much as digits as its factorization.

25130639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474216.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 25130639 is about 5013.0468778977. The cubic root of 25130639 is about 292.9102102298.

The spelling of 25130639 in words is "twenty-five million, one hundred thirty thousand, six hundred thirty-nine".