25780393 has 4 divisors (see below), whose sum is σ = 26328960. Its totient is φ = 25231828.

The previous prime is 25780367. The next prime is 25780409. The reversal of 25780393 is 39308752.

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 25780393 - 2²¹ = 23683241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25780793) 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, 274213 + ... + 274306.

It is an arithmetic number, because the mean of its divisors is an integer number (6582240).

Almost surely, 2^25780393 is an apocalyptic number.

It is an amenable number.

25780393 is a deficient number, since it is larger than the sum of its proper divisors (548567).

25780393 is an equidigital number, since it uses as much as digits as its factorization.

25780393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548566.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 25780393 is about 5077.4396106699. The cubic root of 25780393 is about 295.4131642471.

The spelling of 25780393 in words is "twenty-five million, seven hundred eighty thousand, three hundred ninety-three".