25998646 has 16 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 12459240.

The previous prime is 25998641. The next prime is 25998689. The reversal of 25998646 is 64689952.

It is a self number, because there is not a number n which added to its sum of digits gives 25998646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25998641) 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 in 7 ways as a sum of consecutive naturals, for example, 4675 + ... + 8593.

It is an arithmetic number, because the mean of its divisors is an integer number (2540160).

Almost surely, 2^25998646 is an apocalyptic number.

25998646 is a deficient number, since it is larger than the sum of its proper divisors (14643914).

25998646 is a wasteful number, since it uses less digits than its factorization.

25998646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4059.

The product of its digits is 933120, while the sum is 49.

The square root of 25998646 is about 5098.8867412407. The cubic root of 25998646 is about 296.2444641621.

The spelling of 25998646 in words is "twenty-five million, nine hundred ninety-eight thousand, six hundred forty-six".