25198643 has 4 divisors (see below), whose sum is σ = 25299288. Its totient is φ = 25098000.

The previous prime is 25198609. The next prime is 25198703. The reversal of 25198643 is 34689152.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25198643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25198597 and 25198606.

It is not an unprimeable number, because it can be changed into a prime (25197643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49946 + ... + 50447.

It is an arithmetic number, because the mean of its divisors is an integer number (6324822).

Almost surely, 2^25198643 is an apocalyptic number.

25198643 is a deficient number, since it is larger than the sum of its proper divisors (100645).

25198643 is a wasteful number, since it uses less digits than its factorization.

25198643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100644.

The product of its digits is 51840, while the sum is 38.

The square root of 25198643 is about 5019.8249969496. The cubic root of 25198643 is about 293.1741791878.

The spelling of 25198643 in words is "twenty-five million, one hundred ninety-eight thousand, six hundred forty-three".