25974949 has 36 divisors (see below), whose sum is σ = 35873292. Its totient is φ = 18627840.

The previous prime is 25974947. The next prime is 25974953. The reversal of 25974949 is 94947952.

25974949 = T₁₈₂ + T₁₈₃ + ... + T₅₄₄.

It can be written as a sum of positive squares in 2 ways, for example, as 5336100 + 20638849 = 2310^2 + 4543^2 .

It is not a de Polignac number, because 25974949 - 2¹ = 25974947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

25974949 is a modest number, since divided by 4949 gives 2597 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25974943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 76909 + ... + 77245.

Almost surely, 2^25974949 is an apocalyptic number.

It is an amenable number.

25974949 is a deficient number, since it is larger than the sum of its proper divisors (9898343).

25974949 is a wasteful number, since it uses less digits than its factorization.

25974949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 368 counting only the distinct ones).

The product of its digits is 816480, while the sum is 49.

The square root of 25974949 is about 5096.5624689589. The cubic root of 25974949 is about 296.1544307681.

The spelling of 25974949 in words is "twenty-five million, nine hundred seventy-four thousand, nine hundred forty-nine".