25403138 has 4 divisors (see below), whose sum is σ = 38104710. Its totient is φ = 12701568.

The previous prime is 25403129. The next prime is 25403173. The reversal of 25403138 is 83130452.

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

It can be written as a sum of positive squares in only one way, i.e., 21743569 + 3659569 = 4663^2 + 1913^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6350783 + ... + 6350786.

Almost surely, 2^25403138 is an apocalyptic number.

25403138 is a deficient number, since it is larger than the sum of its proper divisors (12701572).

25403138 is a wasteful number, since it uses less digits than its factorization.

25403138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12701571.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 25403138 is about 5040.1525770556. The cubic root of 25403138 is about 293.9651107039.

The spelling of 25403138 in words is "twenty-five million, four hundred three thousand, one hundred thirty-eight".