25729997 has 4 divisors (see below), whose sum is σ = 25873920. Its totient is φ = 25586076.

The previous prime is 25729981. The next prime is 25729999. The reversal of 25729997 is 79992752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25729997 - 2⁴ = 25729981 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25729999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71693 + ... + 72050.

It is an arithmetic number, because the mean of its divisors is an integer number (6468480).

Almost surely, 2^25729997 is an apocalyptic number.

It is an amenable number.

25729997 is a deficient number, since it is larger than the sum of its proper divisors (143923).

25729997 is a wasteful number, since it uses less digits than its factorization.

25729997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143922.

The product of its digits is 714420, while the sum is 50.

The square root of 25729997 is about 5072.4744454753. The cubic root of 25729997 is about 295.2205456001.

The spelling of 25729997 in words is "twenty-five million, seven hundred twenty-nine thousand, nine hundred ninety-seven".