25742543 has 4 divisors (see below), whose sum is σ = 26861808. Its totient is φ = 24623280.

The previous prime is 25742537. The next prime is 25742551. The reversal of 25742543 is 34524752.

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

It is a cyclic number.

It is not a de Polignac number, because 25742543 - 2¹⁶ = 25677007 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25742503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559598 + ... + 559643.

It is an arithmetic number, because the mean of its divisors is an integer number (6715452).

Almost surely, 2^25742543 is an apocalyptic number.

25742543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

25742543 is a deficient number, since it is larger than the sum of its proper divisors (1119265).

25742543 is a wasteful number, since it uses less digits than its factorization.

25742543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119264.

The product of its digits is 33600, while the sum is 32.

The square root of 25742543 is about 5073.7109693005. The cubic root of 25742543 is about 295.2685211871.

The spelling of 25742543 in words is "twenty-five million, seven hundred forty-two thousand, five hundred forty-three".