25709397 has 8 divisors (see below), whose sum is σ = 39176256. Its totient is φ = 14691072.

The previous prime is 25709381. The next prime is 25709401. The reversal of 25709397 is 79390752.

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

It is not a de Polignac number, because 25709397 - 2⁴ = 25709381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25709317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612108 + ... + 612149.

It is an arithmetic number, because the mean of its divisors is an integer number (4897032).

Almost surely, 2^25709397 is an apocalyptic number.

It is an amenable number.

25709397 is a deficient number, since it is larger than the sum of its proper divisors (13466859).

25709397 is a wasteful number, since it uses less digits than its factorization.

25709397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224267.

The product of its (nonzero) digits is 119070, while the sum is 42.

The square root of 25709397 is about 5070.4434717291. The cubic root of 25709397 is about 295.1417378831.

It can be divided in two parts, 25709 and 397, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 25709397 in words is "twenty-five million, seven hundred nine thousand, three hundred ninety-seven".