25139187 has 16 divisors (see below), whose sum is σ = 37320480. Its totient is φ = 16724736.

The previous prime is 25139159. The next prime is 25139227. The reversal of 25139187 is 78193152.

It is not a de Polignac number, because 25139187 - 2¹¹ = 25137139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25139117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25243 + ... + 26219.

It is an arithmetic number, because the mean of its divisors is an integer number (2332530).

Almost surely, 2^25139187 is an apocalyptic number.

25139187 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

25139187 is a deficient number, since it is larger than the sum of its proper divisors (12181293).

25139187 is an equidigital number, since it uses as much as digits as its factorization.

25139187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939 (or 1933 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 25139187 is about 5013.8993807216. The cubic root of 25139187 is about 292.9434168751.

The spelling of 25139187 in words is "twenty-five million, one hundred thirty-nine thousand, one hundred eighty-seven".