25379999 has 2 divisors, whose sum is σ = 25380000. Its totient is φ = 25379998.

The previous prime is 25379993. The next prime is 25380011. The reversal of 25379999 is 99997352.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25379999 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

25379999 is a modest number, since divided by 9999 gives 2537 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 25379999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25379993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12689999 + 12690000.

It is an arithmetic number, because the mean of its divisors is an integer number (12690000).

Almost surely, 2^25379999 is an apocalyptic number.

25379999 is a deficient number, since it is larger than the sum of its proper divisors (1).

25379999 is an equidigital number, since it uses as much as digits as its factorization.

25379999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1377810, while the sum is 53.

The square root of 25379999 is about 5037.8565878754. The cubic root of 25379999 is about 293.8758287550.

The spelling of 25379999 in words is "twenty-five million, three hundred seventy-nine thousand, nine hundred ninety-nine".