25138431 has 20 divisors (see below), whose sum is σ = 37688112. Its totient is φ = 16698528.

The previous prime is 25138391. The next prime is 25138439. The reversal of 25138431 is 13483152.

It is a happy number.

25138431 is a `hidden beast` number, since 251 + 384 + 31 = 666.

It is not a de Polignac number, because 25138431 - 2¹¹ = 25136383 is a prime.

It is a super-2 number, since 2×25138431² = 1263881426283522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 25138395 and 25138404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25138439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40435 + ... + 41051.

Almost surely, 2^25138431 is an apocalyptic number.

25138431 is a deficient number, since it is larger than the sum of its proper divisors (12549681).

25138431 is an equidigital number, since it uses as much as digits as its factorization.

25138431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132 (or 1123 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 25138431 is about 5013.8239897308. The cubic root of 25138431 is about 292.9404803250.

The spelling of 25138431 in words is "twenty-five million, one hundred thirty-eight thousand, four hundred thirty-one".