18007769 has 4 divisors (see below), whose sum is σ = 19392996. Its totient is φ = 16622544.

The previous prime is 18007747. The next prime is 18007771. The reversal of 18007769 is 96770081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96770081 = 43 ⋅2250467.

It can be written as a sum of positive squares in 2 ways, for example, as 9684544 + 8323225 = 3112^2 + 2885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18007769 is a prime.

It is a super-2 number, since 2×18007769² = 648559488714722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18007729) 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, 692594 + ... + 692619.

It is an arithmetic number, because the mean of its divisors is an integer number (4848249).

Almost surely, 2^18007769 is an apocalyptic number.

It is an amenable number.

18007769 is a deficient number, since it is larger than the sum of its proper divisors (1385227).

18007769 is a wasteful number, since it uses less digits than its factorization.

18007769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385226.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 18007769 is about 4243.5561737769. The cubic root of 18007769 is about 262.1118387011. Note that the first 3 decimals are identical.

The spelling of 18007769 in words is "eighteen million, seven thousand, seven hundred sixty-nine".