25421409 has 24 divisors (see below), whose sum is σ = 41873832. Its totient is φ = 14722560.

The previous prime is 25421393. The next prime is 25421413. The reversal of 25421409 is 90412452.

25421409 is a `hidden beast` number, since 254 + 2 + 1 + 409 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5198400 + 20223009 = 2280^2 + 4497^2 .

It is not a de Polignac number, because 25421409 - 2⁴ = 25421393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25429409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4402 + ... + 8379.

It is an arithmetic number, because the mean of its divisors is an integer number (1744743).

Almost surely, 2^25421409 is an apocalyptic number.

It is an amenable number.

25421409 is a deficient number, since it is larger than the sum of its proper divisors (16452423).

25421409 is a wasteful number, since it uses less digits than its factorization.

25421409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12817 (or 12814 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 25421409 is about 5041.9647955931. The cubic root of 25421409 is about 294.0355711507.

The spelling of 25421409 in words is "twenty-five million, four hundred twenty-one thousand, four hundred nine".