25138779 has 16 divisors (see below), whose sum is σ = 34425600. Its totient is φ = 16311456.

The previous prime is 25138759. The next prime is 25138783. The reversal of 25138779 is 97783152.

It is not a de Polignac number, because 25138779 - 2¹³ = 25130587 is a prime.

It is a super-2 number, since 2×25138779² = 1263916419221682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25138779.

It is not an unprimeable number, because it can be changed into a prime (25138739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18642 + ... + 19944.

It is an arithmetic number, because the mean of its divisors is an integer number (2151600).

Almost surely, 2^25138779 is an apocalyptic number.

25138779 is a deficient number, since it is larger than the sum of its proper divisors (9286821).

25138779 is a wasteful number, since it uses less digits than its factorization.

25138779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474.

The product of its digits is 105840, while the sum is 42.

The square root of 25138779 is about 5013.8586936610. The cubic root of 25138779 is about 292.9418320776.

The spelling of 25138779 in words is "twenty-five million, one hundred thirty-eight thousand, seven hundred seventy-nine".