25237987 has 4 divisors (see below), whose sum is σ = 25483120. Its totient is φ = 24992856.

The previous prime is 25237973. The next prime is 25237991. The reversal of 25237987 is 78973252.

25237987 is nontrivially palindromic in base 5.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25237987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25237967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122412 + ... + 122617.

It is an arithmetic number, because the mean of its divisors is an integer number (6370780).

Almost surely, 2^25237987 is an apocalyptic number.

25237987 is a deficient number, since it is larger than the sum of its proper divisors (245133).

25237987 is a wasteful number, since it uses less digits than its factorization.

25237987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245132.

The product of its digits is 211680, while the sum is 43.

The square root of 25237987 is about 5023.7423301758. The cubic root of 25237987 is about 293.3266827292.

The spelling of 25237987 in words is "twenty-five million, two hundred thirty-seven thousand, nine hundred eighty-seven".