25123987 has 4 divisors (see below), whose sum is σ = 28713136. Its totient is φ = 21534840.

The previous prime is 25123957. The next prime is 25123993. The reversal of 25123987 is 78932152.

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 25123987 - 2¹¹ = 25121939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25123907) 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, 1794564 + ... + 1794577.

It is an arithmetic number, because the mean of its divisors is an integer number (7178284).

Almost surely, 2^25123987 is an apocalyptic number.

25123987 is a deficient number, since it is larger than the sum of its proper divisors (3589149).

25123987 is an equidigital number, since it uses as much as digits as its factorization.

25123987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589148.

The product of its digits is 30240, while the sum is 37.

The square root of 25123987 is about 5012.3833652266. The cubic root of 25123987 is about 292.8843638163.

The spelling of 25123987 in words is "twenty-five million, one hundred twenty-three thousand, nine hundred eighty-seven".