25890409 has 2 divisors, whose sum is σ = 25890410. Its totient is φ = 25890408.

The previous prime is 25890401. The next prime is 25890457. The reversal of 25890409 is 90409852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21902400 + 3988009 = 4680^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 25890409 - 2³ = 25890401 is a prime.

It is not a weakly prime, because it can be changed into another prime (25890401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12945204 + 12945205.

It is an arithmetic number, because the mean of its divisors is an integer number (12945205).

Almost surely, 2^25890409 is an apocalyptic number.

It is an amenable number.

25890409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25890409 is an equidigital number, since it uses as much as digits as its factorization.

25890409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 25890409 is about 5088.2618839836. The cubic root of 25890409 is about 295.8327861569.

The spelling of 25890409 in words is "twenty-five million, eight hundred ninety thousand, four hundred nine".