25909949 has 8 divisors (see below), whose sum is σ = 27958392. Its totient is φ = 23869440.

The previous prime is 25909913. The next prime is 25909957. The reversal of 25909949 is 94990952.

It can be written as a sum of positive squares in 4 ways, for example, as 3678724 + 22231225 = 1918^2 + 4715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25909949 - 2²⁴ = 9132733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25900949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6029 + ... + 9389.

It is an arithmetic number, because the mean of its divisors is an integer number (3494799).

Almost surely, 2^25909949 is an apocalyptic number.

It is an amenable number.

25909949 is a deficient number, since it is larger than the sum of its proper divisors (2048443).

25909949 is a wasteful number, since it uses less digits than its factorization.

25909949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 25909949 is about 5090.1816274078. The cubic root of 25909949 is about 295.9071910458.

The spelling of 25909949 in words is "twenty-five million, nine hundred nine thousand, nine hundred forty-nine".