25742491 has 4 divisors (see below), whose sum is σ = 26438272. Its totient is φ = 25046712.

The previous prime is 25742489. The next prime is 25742503. The reversal of 25742491 is 19424752.

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 25742491 - 2¹ = 25742489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25742411) 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, 347835 + ... + 347908.

It is an arithmetic number, because the mean of its divisors is an integer number (6609568).

Almost surely, 2^25742491 is an apocalyptic number.

25742491 is a deficient number, since it is larger than the sum of its proper divisors (695781).

25742491 is an equidigital number, since it uses as much as digits as its factorization.

25742491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695780.

The product of its digits is 20160, while the sum is 34.

The square root of 25742491 is about 5073.7058448436. The cubic root of 25742491 is about 295.2683223726.

The spelling of 25742491 in words is "twenty-five million, seven hundred forty-two thousand, four hundred ninety-one".