25820389 has 4 divisors (see below), whose sum is σ = 29509024. Its totient is φ = 22131756.

The previous prime is 25820323. The next prime is 25820407. The reversal of 25820389 is 98302852.

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 25820389 - 2⁷ = 25820261 is a prime.

It is a super-2 number, since 2×25820389² = 1333384976222642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25820689) 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, 1844307 + ... + 1844320.

It is an arithmetic number, because the mean of its divisors is an integer number (7377256).

Almost surely, 2^25820389 is an apocalyptic number.

It is an amenable number.

25820389 is a deficient number, since it is larger than the sum of its proper divisors (3688635).

25820389 is an equidigital number, since it uses as much as digits as its factorization.

25820389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688634.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 25820389 is about 5081.3766835376. The cubic root of 25820389 is about 295.5658544463.

The spelling of 25820389 in words is "twenty-five million, eight hundred twenty thousand, three hundred eighty-nine".