18047497 has 4 divisors (see below), whose sum is σ = 19435780. Its totient is φ = 16659216.

The previous prime is 18047467. The next prime is 18047501. The reversal of 18047497 is 79474081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79474081 = 1193 ⋅66617.

It can be written as a sum of positive squares in 2 ways, for example, as 9585216 + 8462281 = 3096^2 + 2909^2 .

It is a cyclic number.

It is not a de Polignac number, because 18047497 - 2¹⁵ = 18014729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18047417) 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, 694122 + ... + 694147.

It is an arithmetic number, because the mean of its divisors is an integer number (4858945).

Almost surely, 2^18047497 is an apocalyptic number.

It is an amenable number.

18047497 is a deficient number, since it is larger than the sum of its proper divisors (1388283).

18047497 is a wasteful number, since it uses less digits than its factorization.

18047497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388282.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 18047497 is about 4248.2345745027. The cubic root of 18047497 is about 262.3044505823.

The spelling of 18047497 in words is "eighteen million, forty-seven thousand, four hundred ninety-seven".