25897921 has 9 divisors (see below), whose sum is σ = 30167649. Its totient is φ = 22167684.

The previous prime is 25897897. The next prime is 25897943. The reversal of 25897921 is 12979852.

The square root of 25897921 is 5089.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 25897921 - 2¹³ = 25889729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25897981) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35260 + ... + 35986.

It is an arithmetic number, because the mean of its divisors is an integer number (3351961).

Almost surely, 2^25897921 is an apocalyptic number.

25897921 is the 5089-th square number.

25897921 is the 2545-th centered octagonal number.

It is an amenable number.

25897921 is a deficient number, since it is larger than the sum of its proper divisors (4269728).

25897921 is an frugal number, since it uses more digits than its factorization.

25897921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 734 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The cubic root of 25897921 is about 295.8613949620.

The spelling of 25897921 in words is "twenty-five million, eight hundred ninety-seven thousand, nine hundred twenty-one".