18694838 has 4 divisors (see below), whose sum is σ = 28042260. Its totient is φ = 9347418.

The previous prime is 18694831. The next prime is 18694843. The reversal of 18694838 is 83849681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83849681 = 4721 ⋅17761.

It is a junction number, because it is equal to n+sod(n) for n = 18694792 and 18694801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18694831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4673708 + ... + 4673711.

It is an arithmetic number, because the mean of its divisors is an integer number (7010565).

Almost surely, 2^18694838 is an apocalyptic number.

18694838 is a deficient number, since it is larger than the sum of its proper divisors (9347422).

18694838 is an equidigital number, since it uses as much as digits as its factorization.

18694838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9347421.

The product of its digits is 331776, while the sum is 47.

The square root of 18694838 is about 4323.7527681402. The cubic root of 18694838 is about 265.4038602926.

The spelling of 18694838 in words is "eighteen million, six hundred ninety-four thousand, eight hundred thirty-eight".