25489945 has 8 divisors (see below), whose sum is σ = 32940936. Its totient is φ = 18823296.

The previous prime is 25489939. The next prime is 25489969. The reversal of 25489945 is 54998452.

It can be written as a sum of positive squares in 4 ways, for example, as 2421136 + 23068809 = 1556^2 + 4803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25489945 is a prime.

It is a super-2 number, since 2×25489945² = 1299474592206050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25489895 and 25489904.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 196012 + ... + 196141.

It is an arithmetic number, because the mean of its divisors is an integer number (4117617).

Almost surely, 2^25489945 is an apocalyptic number.

It is an amenable number.

25489945 is a deficient number, since it is larger than the sum of its proper divisors (7450991).

25489945 is a wasteful number, since it uses less digits than its factorization.

25489945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392171.

The product of its digits is 518400, while the sum is 46.

The square root of 25489945 is about 5048.7567776632. The cubic root of 25489945 is about 294.2995735520.

The spelling of 25489945 in words is "twenty-five million, four hundred eighty-nine thousand, nine hundred forty-five".