18768739 has 4 divisors (see below), whose sum is σ = 20475000. Its totient is φ = 17062480.

The previous prime is 18768727. The next prime is 18768773. The reversal of 18768739 is 93786781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93786781 = 11 ⋅8526071.

It is a cyclic number.

It is not a de Polignac number, because 18768739 - 2²³ = 10380131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18768692 and 18768701.

It is not an unprimeable number, because it can be changed into a prime (18768709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853114 + ... + 853135.

It is an arithmetic number, because the mean of its divisors is an integer number (5118750).

Almost surely, 2^18768739 is an apocalyptic number.

18768739 is a deficient number, since it is larger than the sum of its proper divisors (1706261).

18768739 is a wasteful number, since it uses less digits than its factorization.

18768739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706260.

The product of its digits is 508032, while the sum is 49.

The square root of 18768739 is about 4332.2902719001. The cubic root of 18768739 is about 265.7531157569.

The spelling of 18768739 in words is "eighteen million, seven hundred sixty-eight thousand, seven hundred thirty-nine".