25779993 has 4 divisors (see below), whose sum is σ = 34373328. Its totient is φ = 17186660.

The previous prime is 25779977. The next prime is 25779997. The reversal of 25779993 is 39997752.

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 25779993 - 2⁴ = 25779977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25779997) 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, 4296663 + ... + 4296668.

It is an arithmetic number, because the mean of its divisors is an integer number (8593332).

Almost surely, 2^25779993 is an apocalyptic number.

It is an amenable number.

25779993 is a deficient number, since it is larger than the sum of its proper divisors (8593335).

25779993 is an equidigital number, since it uses as much as digits as its factorization.

25779993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8593334.

The product of its digits is 1071630, while the sum is 51.

The square root of 25779993 is about 5077.4002205853. The cubic root of 25779993 is about 295.4116363951.

The spelling of 25779993 in words is "twenty-five million, seven hundred seventy-nine thousand, nine hundred ninety-three".