25421787 has 6 divisors (see below), whose sum is σ = 36720372. Its totient is φ = 16947852.

The previous prime is 25421779. The next prime is 25421797. The reversal of 25421787 is 78712452.

It is not a de Polignac number, because 25421787 - 2³ = 25421779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25421797) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1412313 + ... + 1412330.

It is an arithmetic number, because the mean of its divisors is an integer number (6120062).

Almost surely, 2^25421787 is an apocalyptic number.

25421787 is a deficient number, since it is larger than the sum of its proper divisors (11298585).

25421787 is a wasteful number, since it uses less digits than its factorization.

25421787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824649 (or 2824646 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 25421787 is about 5042.0022808404. The cubic root of 25421787 is about 294.0370285168.

The spelling of 25421787 in words is "twenty-five million, four hundred twenty-one thousand, seven hundred eighty-seven".