25687949 has 8 divisors (see below), whose sum is σ = 29481408. Its totient is φ = 21925440.

The previous prime is 25687927. The next prime is 25687957. The reversal of 25687949 is 94978652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25687949 - 2⁸ = 25687693 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25687897 and 25687906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25687549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5927 + ... + 9300.

It is an arithmetic number, because the mean of its divisors is an integer number (3685176).

Almost surely, 2^25687949 is an apocalyptic number.

It is an amenable number.

25687949 is a deficient number, since it is larger than the sum of its proper divisors (3793459).

25687949 is a wasteful number, since it uses less digits than its factorization.

25687949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15475.

The product of its digits is 1088640, while the sum is 50.

The square root of 25687949 is about 5068.3280280582. The cubic root of 25687949 is about 295.0596412976.

The spelling of 25687949 in words is "twenty-five million, six hundred eighty-seven thousand, nine hundred forty-nine".