18422687 has 4 divisors (see below), whose sum is σ = 18431400. Its totient is φ = 18413976.

The previous prime is 18422669. The next prime is 18422693. The reversal of 18422687 is 78622481.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78622481 = 7 ⋅11231783.

It is a cyclic number.

It is not a de Polignac number, because 18422687 - 2⁶ = 18422623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18422687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18422617) 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, 1064 + ... + 6162.

It is an arithmetic number, because the mean of its divisors is an integer number (4607850).

Almost surely, 2^18422687 is an apocalyptic number.

18422687 is a deficient number, since it is larger than the sum of its proper divisors (8713).

18422687 is an equidigital number, since it uses as much as digits as its factorization.

18422687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8712.

The product of its digits is 43008, while the sum is 38.

The square root of 18422687 is about 4292.1657703309. The cubic root of 18422687 is about 264.1096833418.

The spelling of 18422687 in words is "eighteen million, four hundred twenty-two thousand, six hundred eighty-seven".