25342409 has 4 divisors (see below), whose sum is σ = 26676240. Its totient is φ = 24008580.

The previous prime is 25342381. The next prime is 25342423. The reversal of 25342409 is 90424352.

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 a de Polignac number, because none of the positive numbers 2^k-25342409 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (25342439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666887 + ... + 666924.

It is an arithmetic number, because the mean of its divisors is an integer number (6669060).

Almost surely, 2^25342409 is an apocalyptic number.

It is an amenable number.

25342409 is a deficient number, since it is larger than the sum of its proper divisors (1333831).

25342409 is a wasteful number, since it uses less digits than its factorization.

25342409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333830.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 25342409 is about 5034.1244521764. The cubic root of 25342409 is about 293.7306717930.

The spelling of 25342409 in words is "twenty-five million, three hundred forty-two thousand, four hundred nine".