25977949 has 2 divisors, whose sum is σ = 25977950. Its totient is φ = 25977948.

The previous prime is 25977937. The next prime is 25977953. The reversal of 25977949 is 94977952.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22629049 + 3348900 = 4757^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 25977949 - 2⁹ = 25977437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25977896 and 25977905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25977929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12988974 + 12988975.

It is an arithmetic number, because the mean of its divisors is an integer number (12988975).

Almost surely, 2^25977949 is an apocalyptic number.

It is an amenable number.

25977949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25977949 is an equidigital number, since it uses as much as digits as its factorization.

25977949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 52.

The square root of 25977949 is about 5096.8567764849. The cubic root of 25977949 is about 296.1658318696.

The spelling of 25977949 in words is "twenty-five million, nine hundred seventy-seven thousand, nine hundred forty-nine".