25840542 has 48 divisors (see below), whose sum is σ = 64752912. Its totient is φ = 6814080.

The previous prime is 25840531. The next prime is 25840543. The reversal of 25840542 is 24504852.

It is a super-2 number, since 2×25840542² = 1335467221707528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25840543) 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 23 ways as a sum of consecutive naturals, for example, 442 + ... + 7202.

It is an arithmetic number, because the mean of its divisors is an integer number (1349019).

Almost surely, 2^25840542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25840542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32376456).

25840542 is an abundant number, since it is smaller than the sum of its proper divisors (38912370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25840542 is a wasteful number, since it uses less digits than its factorization.

25840542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6793 (or 6786 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 25840542 is about 5083.3593223379. The cubic root of 25840542 is about 295.6427315430.

The spelling of 25840542 in words is "twenty-five million, eight hundred forty thousand, five hundred forty-two".