25987993 has 2 divisors, whose sum is σ = 25987994. Its totient is φ = 25987992.

The previous prime is 25987987. The next prime is 25988021. The reversal of 25987993 is 39978952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18386944 + 7601049 = 4288^2 + 2757^2 .

It is a cyclic number.

It is not a de Polignac number, because 25987993 - 2⁵ = 25987961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25987993.

It is not a weakly prime, because it can be changed into another prime (25987903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12993996 + 12993997.

It is an arithmetic number, because the mean of its divisors is an integer number (12993997).

Almost surely, 2^25987993 is an apocalyptic number.

It is an amenable number.

25987993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25987993 is an equidigital number, since it uses as much as digits as its factorization.

25987993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 52.

The square root of 25987993 is about 5097.8419944129. The cubic root of 25987993 is about 296.2039963698.

The spelling of 25987993 in words is "twenty-five million, nine hundred eighty-seven thousand, nine hundred ninety-three".