25720493 has 4 divisors (see below), whose sum is σ = 26318688. Its totient is φ = 25122300.

The previous prime is 25720469. The next prime is 25720501. The reversal of 25720493 is 39402752.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25720493 - 2¹⁴ = 25704109 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 (25720193) 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 3 ways as a sum of consecutive naturals, for example, 299033 + ... + 299118.

It is an arithmetic number, because the mean of its divisors is an integer number (6579672).

Almost surely, 2^25720493 is an apocalyptic number.

It is an amenable number.

25720493 is a deficient number, since it is larger than the sum of its proper divisors (598195).

25720493 is an equidigital number, since it uses as much as digits as its factorization.

25720493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598194.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 25720493 is about 5071.5375380648. The cubic root of 25720493 is about 295.1841921615.

The spelling of 25720493 in words is "twenty-five million, seven hundred twenty thousand, four hundred ninety-three".