18218007 has 8 divisors (see below), whose sum is σ = 26989680. Its totient is φ = 12145320.

The previous prime is 18217993. The next prime is 18218027. The reversal of 18218007 is 70081281.

It is not a de Polignac number, because 18218007 - 2¹² = 18213911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 674741 = 18218007 / (1 + 8 + 2 + 1 + 8 + 0 + 0 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218027) 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, 337344 + ... + 337397.

It is an arithmetic number, because the mean of its divisors is an integer number (3373710).

Almost surely, 2^18218007 is an apocalyptic number.

18218007 is a deficient number, since it is larger than the sum of its proper divisors (8771673).

18218007 is an equidigital number, since it uses as much as digits as its factorization.

18218007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674750 (or 674744 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 18218007 is about 4268.2557327320. The cubic root of 18218007 is about 263.1279334402.

Adding to 18218007 its reverse (70081281), we get a palindrome (88299288).

The spelling of 18218007 in words is "eighteen million, two hundred eighteen thousand, seven".