25218139 has 8 divisors (see below), whose sum is σ = 26404560. Its totient is φ = 24052896.

The previous prime is 25218133. The next prime is 25218161. The reversal of 25218139 is 93181252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25218139 - 2⁹ = 25217627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25218139.

It is not an unprimeable number, because it can be changed into a prime (25218133) 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 7 ways as a sum of consecutive naturals, for example, 2832 + ... + 7645.

It is an arithmetic number, because the mean of its divisors is an integer number (3300570).

Almost surely, 2^25218139 is an apocalyptic number.

25218139 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25218139 is a deficient number, since it is larger than the sum of its proper divisors (1186421).

25218139 is a wasteful number, since it uses less digits than its factorization.

25218139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10589.

The product of its digits is 4320, while the sum is 31.

The square root of 25218139 is about 5021.7665218526. The cubic root of 25218139 is about 293.2497685804.

The spelling of 25218139 in words is "twenty-five million, two hundred eighteen thousand, one hundred thirty-nine".