25240643 has 4 divisors (see below), whose sum is σ = 26111040. Its totient is φ = 24370248.

The previous prime is 25240639. The next prime is 25240681. The reversal of 25240643 is 34604252.

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 25240643 - 2² = 25240639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25240693) 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, 435155 + ... + 435212.

It is an arithmetic number, because the mean of its divisors is an integer number (6527760).

Almost surely, 2^25240643 is an apocalyptic number.

25240643 is a deficient number, since it is larger than the sum of its proper divisors (870397).

25240643 is an equidigital number, since it uses as much as digits as its factorization.

25240643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870396.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 25240643 is about 5024.0066679892. The cubic root of 25240643 is about 293.3369720910.

Adding to 25240643 its reverse (34604252), we get a palindrome (59844895).

The spelling of 25240643 in words is "twenty-five million, two hundred forty thousand, six hundred forty-three".