25949639 has 2 divisors, whose sum is σ = 25949640. Its totient is φ = 25949638.

The previous prime is 25949621. The next prime is 25949657. The reversal of 25949639 is 93694952.

It is a balanced prime because it is at equal distance from previous prime (25949621) and next prime (25949657).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25949639 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25949593 and 25949602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25949669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12974819 + 12974820.

It is an arithmetic number, because the mean of its divisors is an integer number (12974820).

Almost surely, 2^25949639 is an apocalyptic number.

25949639 is a deficient number, since it is larger than the sum of its proper divisors (1).

25949639 is an equidigital number, since it uses as much as digits as its factorization.

25949639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 47.

The square root of 25949639 is about 5094.0788176078. The cubic root of 25949639 is about 296.0582085123.

The spelling of 25949639 in words is "twenty-five million, nine hundred forty-nine thousand, six hundred thirty-nine".