25629947 has 4 divisors (see below), whose sum is σ = 29291376. Its totient is φ = 21968520.

The previous prime is 25629907. The next prime is 25629973. The reversal of 25629947 is 74992652.

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

It is not a de Polignac number, because 25629947 - 2⁸ = 25629691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25629898 and 25629907.

It is not an unprimeable number, because it can be changed into a prime (25629907) 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, 1830704 + ... + 1830717.

It is an arithmetic number, because the mean of its divisors is an integer number (7322844).

Almost surely, 2^25629947 is an apocalyptic number.

25629947 is a deficient number, since it is larger than the sum of its proper divisors (3661429).

25629947 is an equidigital number, since it uses as much as digits as its factorization.

25629947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661428.

The product of its digits is 272160, while the sum is 44.

The square root of 25629947 is about 5062.6027890799. The cubic root of 25629947 is about 294.8373977031.

It can be divided in two parts, 256 and 29947, that added together give a palindrome (30203).

The spelling of 25629947 in words is "twenty-five million, six hundred twenty-nine thousand, nine hundred forty-seven".