25440438 has 16 divisors (see below), whose sum is σ = 53093376. Its totient is φ = 8111400.

The previous prime is 25440433. The next prime is 25440439. The reversal of 25440438 is 83404452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25440431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92038 + ... + 92313.

It is an arithmetic number, because the mean of its divisors is an integer number (3318336).

Almost surely, 2^25440438 is an apocalyptic number.

25440438 is an abundant number, since it is smaller than the sum of its proper divisors (27652938).

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

25440438 is a wasteful number, since it uses less digits than its factorization.

25440438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184379.

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 25440438 is about 5043.8515045548. The cubic root of 25440438 is about 294.1089188735.

It can be divided in two parts, 25440 and 438, that added together give a triangular number (25878 = T₂₂₇).

The spelling of 25440438 in words is "twenty-five million, four hundred forty thousand, four hundred thirty-eight".