25981436 has 24 divisors (see below), whose sum is σ = 51544080. Its totient is φ = 11359872.

The previous prime is 25981429. The next prime is 25981447. The reversal of 25981436 is 63418952.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 25981436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12161 + ... + 14136.

It is an arithmetic number, because the mean of its divisors is an integer number (2147670).

Almost surely, 2^25981436 is an apocalyptic number.

25981436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

25981436 is a deficient number, since it is larger than the sum of its proper divisors (25562644).

25981436 is a wasteful number, since it uses less digits than its factorization.

25981436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26333 (or 26331 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 25981436 is about 5097.1988385779. The cubic root of 25981436 is about 296.1790826469.

The spelling of 25981436 in words is "twenty-five million, nine hundred eighty-one thousand, four hundred thirty-six".