25217429 has 4 divisors (see below), whose sum is σ = 25232076. Its totient is φ = 25202784.

The previous prime is 25217417. The next prime is 25217431. The reversal of 25217429 is 92471252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6770404 + 18447025 = 2602^2 + 4295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25217429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25217395 and 25217404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25217629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4334 + ... + 8319.

It is an arithmetic number, because the mean of its divisors is an integer number (6308019).

Almost surely, 2^25217429 is an apocalyptic number.

It is an amenable number.

25217429 is a deficient number, since it is larger than the sum of its proper divisors (14647).

25217429 is a wasteful number, since it uses less digits than its factorization.

25217429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14646.

The product of its digits is 10080, while the sum is 32.

The square root of 25217429 is about 5021.6958291000. The cubic root of 25217429 is about 293.2470164703.

The spelling of 25217429 in words is "twenty-five million, two hundred seventeen thousand, four hundred twenty-nine".