25397509 has 8 divisors (see below), whose sum is σ = 26792480. Its totient is φ = 24008400.

The previous prime is 25397483. The next prime is 25397513. The reversal of 25397509 is 90579352.

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

It is not a de Polignac number, because 25397509 - 2⁷ = 25397381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25397549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9679 + ... + 12019.

It is an arithmetic number, because the mean of its divisors is an integer number (3349060).

Almost surely, 2^25397509 is an apocalyptic number.

It is an amenable number.

25397509 is a deficient number, since it is larger than the sum of its proper divisors (1394971).

25397509 is a wasteful number, since it uses less digits than its factorization.

25397509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931.

The product of its (nonzero) digits is 85050, while the sum is 40.

The square root of 25397509 is about 5039.5941304831. The cubic root of 25397509 is about 293.9433961708.

The spelling of 25397509 in words is "twenty-five million, three hundred ninety-seven thousand, five hundred nine".