25809486 has 32 divisors (see below), whose sum is σ = 55503360. Its totient is φ = 7975296.

The previous prime is 25809481. The next prime is 25809493. The reversal of 25809486 is 68490852.

It is a super-2 number, since 2×25809486² = 1332259135168392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25809481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2950 + ... + 7766.

It is an arithmetic number, because the mean of its divisors is an integer number (1734480).

Almost surely, 2^25809486 is an apocalyptic number.

25809486 is an abundant number, since it is smaller than the sum of its proper divisors (29693874).

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

25809486 is a wasteful number, since it uses less digits than its factorization.

With its successor (25809487) it forms an eRAP, since the sums of their prime factors are consecutive (4888 and 4889).

25809486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4888.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 25809486 is about 5080.3037310775. The cubic root of 25809486 is about 295.5242463950.

The spelling of 25809486 in words is "twenty-five million, eight hundred nine thousand, four hundred eighty-six".