18425897 has 4 divisors (see below), whose sum is σ = 21058176. Its totient is φ = 15793620.

The previous prime is 18425879. The next prime is 18425923. The reversal of 18425897 is 79852481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79852481 = 23 ⋅3471847.

It is a cyclic number.

It is not a de Polignac number, because 18425897 - 2¹⁰ = 18424873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18425837) 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, 1316129 + ... + 1316142.

It is an arithmetic number, because the mean of its divisors is an integer number (5264544).

Almost surely, 2^18425897 is an apocalyptic number.

It is an amenable number.

18425897 is a deficient number, since it is larger than the sum of its proper divisors (2632279).

18425897 is an equidigital number, since it uses as much as digits as its factorization.

18425897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632278.

The product of its digits is 161280, while the sum is 44.

The square root of 18425897 is about 4292.5396911386. The cubic root of 18425897 is about 264.1250220896.

The spelling of 18425897 in words is "eighteen million, four hundred twenty-five thousand, eight hundred ninety-seven".