18612207 has 8 divisors (see below), whose sum is σ = 27573680. Its totient is φ = 12408120.

The previous prime is 18612157. The next prime is 18612211. The reversal of 18612207 is 70221681.

It is not a de Polignac number, because 18612207 - 2⁷ = 18612079 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: 689341 = 18612207 / (1 + 8 + 6 + 1 + 2 + 2 + 0 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18612227) 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, 344644 + ... + 344697.

It is an arithmetic number, because the mean of its divisors is an integer number (3446710).

Almost surely, 2^18612207 is an apocalyptic number.

18612207 is a deficient number, since it is larger than the sum of its proper divisors (8961473).

18612207 is an equidigital number, since it uses as much as digits as its factorization.

18612207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689350 (or 689344 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 18612207 is about 4314.1867136229. The cubic root of 18612207 is about 265.0122552775.

Adding to 18612207 its reverse (70221681), we get a palindrome (88833888).

The spelling of 18612207 in words is "eighteen million, six hundred twelve thousand, two hundred seven".