25193987 has 12 divisors (see below), whose sum is σ = 31562496. Its totient is φ = 19933200.

The previous prime is 25193977. The next prime is 25193989. The reversal of 25193987 is 78939152.

It is not a de Polignac number, because 25193987 - 2⁶ = 25193923 is a prime.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (25193989) 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, 19139 + ... + 20412.

It is an arithmetic number, because the mean of its divisors is an integer number (2630208).

Almost surely, 2^25193987 is an apocalyptic number.

25193987 is a deficient number, since it is larger than the sum of its proper divisors (6368509).

25193987 is a wasteful number, since it uses less digits than its factorization.

25193987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39578 (or 39571 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 25193987 is about 5019.3612143379. The cubic root of 25193987 is about 293.1561212966.

The spelling of 25193987 in words is "twenty-five million, one hundred ninety-three thousand, nine hundred eighty-seven".