25998403 has 4 divisors (see below), whose sum is σ = 27366760. Its totient is φ = 24630048.

The previous prime is 25998317. The next prime is 25998407. The reversal of 25998403 is 30489952.

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-25998403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25998407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684150 + ... + 684187.

It is an arithmetic number, because the mean of its divisors is an integer number (6841690).

Almost surely, 2^25998403 is an apocalyptic number.

25998403 is a deficient number, since it is larger than the sum of its proper divisors (1368357).

25998403 is a wasteful number, since it uses less digits than its factorization.

25998403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368356.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 25998403 is about 5098.8629124541. The cubic root of 25998403 is about 296.2435411957.

The spelling of 25998403 in words is "twenty-five million, nine hundred ninety-eight thousand, four hundred three".