25539947 has 4 divisors (see below), whose sum is σ = 25673856. Its totient is φ = 25406040.

The previous prime is 25539911. The next prime is 25539949. The reversal of 25539947 is 74993552.

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

It is a cyclic number.

It is not a de Polignac number, because 25539947 - 2¹⁰ = 25538923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25539898 and 25539907.

It is not an unprimeable number, because it can be changed into a prime (25539949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66668 + ... + 67049.

It is an arithmetic number, because the mean of its divisors is an integer number (6418464).

Almost surely, 2^25539947 is an apocalyptic number.

25539947 is a deficient number, since it is larger than the sum of its proper divisors (133909).

25539947 is a wasteful number, since it uses less digits than its factorization.

25539947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133908.

The product of its digits is 340200, while the sum is 44.

The square root of 25539947 is about 5053.7062637237. The cubic root of 25539947 is about 294.4918840958.

The spelling of 25539947 in words is "twenty-five million, five hundred thirty-nine thousand, nine hundred forty-seven".