25999000 has 32 divisors (see below), whose sum is σ = 60840000. Its totient is φ = 10399200.

The previous prime is 25998983. The next prime is 25999009. The reversal of 25999000 is 99952.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25999009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12000 + ... + 13999.

It is an arithmetic number, because the mean of its divisors is an integer number (1901250).

Almost surely, 2^25999000 is an apocalyptic number.

25999000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25999000 is an abundant number, since it is smaller than the sum of its proper divisors (34841000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25999000 is a wasteful number, since it uses less digits than its factorization.

25999000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26020 (or 26006 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 25999000 is about 5098.9214545823. The cubic root of 25999000 is about 296.2458087202.

The spelling of 25999000 in words is "twenty-five million, nine hundred ninety-nine thousand".