18071969 has 8 divisors (see below), whose sum is σ = 19178208. Its totient is φ = 16970560.

The previous prime is 18071957. The next prime is 18071971. The reversal of 18071969 is 96917081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18071969 - 2¹² = 18067873 is a prime.

It is a super-2 number, since 2×18071969² = 653192127073922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18071929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9074 + ... + 10884.

It is an arithmetic number, because the mean of its divisors is an integer number (2397276).

Almost surely, 2^18071969 is an apocalyptic number.

It is an amenable number.

18071969 is a deficient number, since it is larger than the sum of its proper divisors (1106239).

18071969 is a wasteful number, since it uses less digits than its factorization.

18071969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 18071969 is about 4251.1138540387. The cubic root of 18071969 is about 262.4229566796.

The spelling of 18071969 in words is "eighteen million, seventy-one thousand, nine hundred sixty-nine".