25143939 has 16 divisors (see below), whose sum is σ = 37713440. Its totient is φ = 16761168.

The previous prime is 25143931. The next prime is 25144019. The reversal of 25143939 is 93934152.

It is a happy number.

It is not a de Polignac number, because 25143939 - 2³ = 25143931 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25143931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3562 + ... + 7935.

It is an arithmetic number, because the mean of its divisors is an integer number (2357090).

Almost surely, 2^25143939 is an apocalyptic number.

25143939 is a deficient number, since it is larger than the sum of its proper divisors (12569501).

25143939 is an frugal number, since it uses more digits than its factorization.

25143939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11518 (or 11500 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 25143939 is about 5014.3732409943. The cubic root of 25143939 is about 292.9618738418.

The spelling of 25143939 in words is "twenty-five million, one hundred forty-three thousand, nine hundred thirty-nine".