18154397 has 4 divisors (see below), whose sum is σ = 18163200. Its totient is φ = 18145596.

The previous prime is 18154363. The next prime is 18154421. The reversal of 18154397 is 79345181.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79345181 = 2957 ⋅26833.

It is a cyclic number.

It is not a de Polignac number, because 18154397 - 2⁶ = 18154333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18154397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18154307) 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 3 ways as a sum of consecutive naturals, for example, 548 + ... + 6050.

It is an arithmetic number, because the mean of its divisors is an integer number (4540800).

Almost surely, 2^18154397 is an apocalyptic number.

It is an amenable number.

18154397 is a deficient number, since it is larger than the sum of its proper divisors (8803).

18154397 is an equidigital number, since it uses as much as digits as its factorization.

18154397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8802.

The product of its digits is 30240, while the sum is 38.

The square root of 18154397 is about 4260.7976952679. The cubic root of 18154397 is about 262.8213304544.

The spelling of 18154397 in words is "eighteen million, one hundred fifty-four thousand, three hundred ninety-seven".