18878743 has 4 divisors (see below), whose sum is σ = 20330968. Its totient is φ = 17426520.

The previous prime is 18878719. The next prime is 18878771. The reversal of 18878743 is 34787881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18878743 - 2⁵ = 18878711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18878693 and 18878702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18878773) 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, 726093 + ... + 726118.

It is an arithmetic number, because the mean of its divisors is an integer number (5082742).

Almost surely, 2^18878743 is an apocalyptic number.

18878743 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18878743 is a deficient number, since it is larger than the sum of its proper divisors (1452225).

18878743 is a wasteful number, since it uses less digits than its factorization.

18878743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452224.

The product of its digits is 301056, while the sum is 46.

The square root of 18878743 is about 4344.9675487856. The cubic root of 18878743 is about 266.2712996986.

The spelling of 18878743 in words is "eighteen million, eight hundred seventy-eight thousand, seven hundred forty-three".