25909403 has 4 divisors (see below), whose sum is σ = 27902448. Its totient is φ = 23916360.

The previous prime is 25909399. The next prime is 25909427. The reversal of 25909403 is 30490952.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25909403 - 2² = 25909399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25909403.

It is not an unprimeable number, because it can be changed into a prime (25909463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996503 + ... + 996528.

It is an arithmetic number, because the mean of its divisors is an integer number (6975612).

Almost surely, 2^25909403 is an apocalyptic number.

25909403 is a deficient number, since it is larger than the sum of its proper divisors (1993045).

25909403 is a wasteful number, since it uses less digits than its factorization.

25909403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993044.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 25909403 is about 5090.1279944614. The cubic root of 25909403 is about 295.9051124818.

The spelling of 25909403 in words is "twenty-five million, nine hundred nine thousand, four hundred three".