25009906 has 4 divisors (see below), whose sum is σ = 37514862. Its totient is φ = 12504952.

The previous prime is 25009903. The next prime is 25009913. The reversal of 25009906 is 60990052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 11282881 = 3705^2 + 3359^2 .

It is a super-3 number, since 3×25009906³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (25009903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6252475 + ... + 6252478.

Almost surely, 2^25009906 is an apocalyptic number.

25009906 is a deficient number, since it is larger than the sum of its proper divisors (12504956).

25009906 is a wasteful number, since it uses less digits than its factorization.

25009906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12504955.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 25009906 is about 5000.9905018906. The cubic root of 25009906 is about 292.4403891477.

Adding to 25009906 its reverse (60990052), we get a palindrome (85999958).

The spelling of 25009906 in words is "twenty-five million, nine thousand, nine hundred six".