18859869 has 12 divisors (see below), whose sum is σ = 31133856. Its totient is φ = 10777032.

The previous prime is 18859861. The next prime is 18859871. The reversal of 18859869 is 96895881.

It is not a de Polignac number, because 18859869 - 2³ = 18859861 is a prime.

It is a super-2 number, since 2×18859869² = 711389317394322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18859861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149619 + ... + 149744.

It is an arithmetic number, because the mean of its divisors is an integer number (2594488).

Almost surely, 2^18859869 is an apocalyptic number.

It is an amenable number.

18859869 is a deficient number, since it is larger than the sum of its proper divisors (12273987).

18859869 is a wasteful number, since it uses less digits than its factorization.

18859869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299376 (or 299373 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The square root of 18859869 is about 4342.7950676955. The cubic root of 18859869 is about 266.1825353103.

The spelling of 18859869 in words is "eighteen million, eight hundred fifty-nine thousand, eight hundred sixty-nine".