25009442 has 4 divisors (see below), whose sum is σ = 37514166. Its totient is φ = 12504720.

The previous prime is 25009433. The next prime is 25009463. The reversal of 25009442 is 24490052.

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., 22762441 + 2247001 = 4771^2 + 1499^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6252359 + ... + 6252362.

Almost surely, 2^25009442 is an apocalyptic number.

25009442 is a deficient number, since it is larger than the sum of its proper divisors (12504724).

25009442 is a wasteful number, since it uses less digits than its factorization.

25009442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12504723.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 25009442 is about 5000.9441108655. The cubic root of 25009442 is about 292.4385806219.

Adding to 25009442 its reverse (24490052), we get a palindrome (49499494).

The spelling of 25009442 in words is "twenty-five million, nine thousand, four hundred forty-two".