25393939 has 2 divisors, whose sum is σ = 25393940. Its totient is φ = 25393938.

The previous prime is 25393889. The next prime is 25393967. The reversal of 25393939 is 93939352.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25393939 - 2¹³ = 25385747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25393895 and 25393904.

It is not a weakly prime, because it can be changed into another prime (25393969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12696969 + 12696970.

It is an arithmetic number, because the mean of its divisors is an integer number (12696970).

Almost surely, 2^25393939 is an apocalyptic number.

25393939 is a deficient number, since it is larger than the sum of its proper divisors (1).

25393939 is an equidigital number, since it uses as much as digits as its factorization.

25393939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196830, while the sum is 43.

The square root of 25393939 is about 5039.2399228455. The cubic root of 25393939 is about 293.9296228109.

The spelling of 25393939 in words is "twenty-five million, three hundred ninety-three thousand, nine hundred thirty-nine".