18006697 has 4 divisors (see below), whose sum is σ = 18346500. Its totient is φ = 17666896.

The previous prime is 18006683. The next prime is 18006701. The reversal of 18006697 is 79660081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11999296 + 6007401 = 3464^2 + 2451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18006697 is a prime.

It is a super-2 number, since 2×18006697² = 648482273699618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18006617) 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, 169822 + ... + 169927.

It is an arithmetic number, because the mean of its divisors is an integer number (4586625).

Almost surely, 2^18006697 is an apocalyptic number.

It is an amenable number.

18006697 is a deficient number, since it is larger than the sum of its proper divisors (339803).

18006697 is an equidigital number, since it uses as much as digits as its factorization.

18006697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339802.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 18006697 is about 4243.4298627408. The cubic root of 18006697 is about 262.1066374374.

The spelling of 18006697 in words is "eighteen million, six thousand, six hundred ninety-seven".