25354639 has 2 divisors, whose sum is σ = 25354640. Its totient is φ = 25354638.

The previous prime is 25354627. The next prime is 25354643. The reversal of 25354639 is 93645352.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25354639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25354598 and 25354607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25354619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12677319 + 12677320.

It is an arithmetic number, because the mean of its divisors is an integer number (12677320).

Almost surely, 2^25354639 is an apocalyptic number.

25354639 is a deficient number, since it is larger than the sum of its proper divisors (1).

25354639 is an equidigital number, since it uses as much as digits as its factorization.

25354639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 37.

The square root of 25354639 is about 5035.3390153991. The cubic root of 25354639 is about 293.7779147156. Note that the first 3 decimals are identical.

The spelling of 25354639 in words is "twenty-five million, three hundred fifty-four thousand, six hundred thirty-nine".