25289999 has 12 divisors (see below), whose sum is σ = 30669552. Its totient is φ = 20357760.

The previous prime is 25289993. The next prime is 25290019. The reversal of 25289999 is 99998252.

It is not a de Polignac number, because 25289999 - 2⁴ = 25289983 is a prime.

It is a Duffinian number.

25289999 is a modest number, since divided by 9999 gives 2528 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 25289999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25289993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54629 + ... + 55089.

It is an arithmetic number, because the mean of its divisors is an integer number (2555796).

Almost surely, 2^25289999 is an apocalyptic number.

25289999 is a deficient number, since it is larger than the sum of its proper divisors (5379553).

25289999 is an frugal number, since it uses more digits than its factorization.

25289999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946 (or 485 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 53.

The square root of 25289999 is about 5028.9162848471. The cubic root of 25289999 is about 293.5280463705.

The spelling of 25289999 in words is "twenty-five million, two hundred eighty-nine thousand, nine hundred ninety-nine".