25140391 has 4 divisors (see below), whose sum is σ = 25614792. Its totient is φ = 24665992.

The previous prime is 25140389. The next prime is 25140457. The reversal of 25140391 is 19304152.

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 25140391 - 2¹ = 25140389 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 (25140301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237121 + ... + 237226.

It is an arithmetic number, because the mean of its divisors is an integer number (6403698).

Almost surely, 2^25140391 is an apocalyptic number.

25140391 is a deficient number, since it is larger than the sum of its proper divisors (474401).

25140391 is an equidigital number, since it uses as much as digits as its factorization.

25140391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474400.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 25140391 is about 5014.0194455147. The cubic root of 25140391 is about 292.9480934814.

The spelling of 25140391 in words is "twenty-five million, one hundred forty thousand, three hundred ninety-one".