25438919 has 24 divisors (see below), whose sum is σ = 30164400. Its totient is φ = 21359360.

The previous prime is 25438909. The next prime is 25438927. The reversal of 25438919 is 91983452.

It is not a de Polignac number, because 25438919 - 2²⁰ = 24390343 is a prime.

It is a super-2 number, since 2×25438919² = 1294277199777122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25438909) 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 23 ways as a sum of consecutive naturals, for example, 170657 + ... + 170805.

It is an arithmetic number, because the mean of its divisors is an integer number (1256850).

Almost surely, 2^25438919 is an apocalyptic number.

25438919 is a deficient number, since it is larger than the sum of its proper divisors (4725481).

25438919 is a wasteful number, since it uses less digits than its factorization.

25438919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 260 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 25438919 is about 5043.7009229335. The cubic root of 25438919 is about 294.1030651963.

The spelling of 25438919 in words is "twenty-five million, four hundred thirty-eight thousand, nine hundred nineteen".