25987021 has 8 divisors (see below), whose sum is σ = 27129600. Its totient is φ = 24863520.

The previous prime is 25986967. The next prime is 25987057. The reversal of 25987021 is 12078952.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25987021 - 2²¹ = 23889869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25987321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1951 + ... + 7468.

It is an arithmetic number, because the mean of its divisors is an integer number (3391200).

Almost surely, 2^25987021 is an apocalyptic number.

It is an amenable number.

25987021 is a deficient number, since it is larger than the sum of its proper divisors (1142579).

25987021 is an equidigital number, since it uses as much as digits as its factorization.

25987021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9539.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 25987021 is about 5097.7466590642. The cubic root of 25987021 is about 296.2003034609.

The spelling of 25987021 in words is "twenty-five million, nine hundred eighty-seven thousand, twenty-one".