25899487 has 4 divisors (see below), whose sum is σ = 26128800. Its totient is φ = 25670176.

The previous prime is 25899481. The next prime is 25899509. The reversal of 25899487 is 78499852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25899487 - 2³ = 25899479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25899481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114487 + ... + 114712.

It is an arithmetic number, because the mean of its divisors is an integer number (6532200).

Almost surely, 2^25899487 is an apocalyptic number.

25899487 is a deficient number, since it is larger than the sum of its proper divisors (229313).

25899487 is a wasteful number, since it uses less digits than its factorization.

25899487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229312.

The product of its digits is 1451520, while the sum is 52.

The square root of 25899487 is about 5089.1538589435. The cubic root of 25899487 is about 295.8673582413.

It can be divided in two parts, 258994 and 87, that added together give a square (259081 = 509²).

The spelling of 25899487 in words is "twenty-five million, eight hundred ninety-nine thousand, four hundred eighty-seven".