25764139 has 2 divisors, whose sum is σ = 25764140. Its totient is φ = 25764138.

The previous prime is 25764127. The next prime is 25764157. The reversal of 25764139 is 93146752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25764139 - 2⁵ = 25764107 is a prime.

It is a super-2 number, since 2×25764139² = 1327581716822642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25764098 and 25764107.

It is not a weakly prime, because it can be changed into another prime (25764119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12882069 + 12882070.

It is an arithmetic number, because the mean of its divisors is an integer number (12882070).

Almost surely, 2^25764139 is an apocalyptic number.

25764139 is a deficient number, since it is larger than the sum of its proper divisors (1).

25764139 is an equidigital number, since it uses as much as digits as its factorization.

25764139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 25764139 is about 5075.8387484238. The cubic root of 25764139 is about 295.3510672491.

The spelling of 25764139 in words is "twenty-five million, seven hundred sixty-four thousand, one hundred thirty-nine".