18779943 has 16 divisors (see below), whose sum is σ = 30818816. Its totient is φ = 9905760.

The previous prime is 18779941. The next prime is 18779977. The reversal of 18779943 is 34997781.

It is not a de Polignac number, because 18779943 - 2¹ = 18779941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18779892 and 18779901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18779941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34123 + ... + 34668.

It is an arithmetic number, because the mean of its divisors is an integer number (1926176).

Almost surely, 2^18779943 is an apocalyptic number.

18779943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18779943 is a deficient number, since it is larger than the sum of its proper divisors (12038873).

18779943 is a wasteful number, since it uses less digits than its factorization.

18779943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68814.

The product of its digits is 381024, while the sum is 48.

The square root of 18779943 is about 4333.5831594652. The cubic root of 18779943 is about 265.8059856848.

The spelling of 18779943 in words is "eighteen million, seven hundred seventy-nine thousand, nine hundred forty-three".