25509923 has 6 divisors (see below), whose sum is σ = 25869564. Its totient is φ = 25155216.

The previous prime is 25509901. The next prime is 25509943. The reversal of 25509923 is 32990552.

It is not a de Polignac number, because 25509923 - 2⁶ = 25509859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25509943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2936 + ... + 7722.

It is an arithmetic number, because the mean of its divisors is an integer number (4311594).

Almost surely, 2^25509923 is an apocalyptic number.

25509923 is a deficient number, since it is larger than the sum of its proper divisors (359641).

25509923 is an frugal number, since it uses more digits than its factorization.

25509923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933 (or 4860 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 25509923 is about 5050.7348970224. The cubic root of 25509923 is about 294.3764402212.

The spelling of 25509923 in words is "twenty-five million, five hundred nine thousand, nine hundred twenty-three".