25138823 has 2 divisors, whose sum is σ = 25138824. Its totient is φ = 25138822.

The previous prime is 25138807. The next prime is 25138837. The reversal of 25138823 is 32883152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25138823 - 2⁴ = 25138807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25138823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25138723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12569411 + 12569412.

It is an arithmetic number, because the mean of its divisors is an integer number (12569412).

Almost surely, 2^25138823 is an apocalyptic number.

25138823 is a deficient number, since it is larger than the sum of its proper divisors (1).

25138823 is an equidigital number, since it uses as much as digits as its factorization.

25138823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 25138823 is about 5013.8630814971. The cubic root of 25138823 is about 292.9420029880.

The spelling of 25138823 in words is "twenty-five million, one hundred thirty-eight thousand, eight hundred twenty-three".