18973039 has 8 divisors (see below), whose sum is σ = 20150640. Its totient is φ = 17813376.

The previous prime is 18972997. The next prime is 18973049. The reversal of 18973039 is 93037981.

18973039 = T₃₅₅₅ + T₃₅₅₆ + T₃₅₅₇.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18973039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18972992 and 18973010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18973049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2272 + ... + 6565.

It is an arithmetic number, because the mean of its divisors is an integer number (2518830).

Almost surely, 2^18973039 is an apocalyptic number.

18973039 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18973039 is the 3557-th centered triangular number.

18973039 is a deficient number, since it is larger than the sum of its proper divisors (1177601).

18973039 is a wasteful number, since it uses less digits than its factorization.

18973039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8969.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 18973039 is about 4355.8052068475. The cubic root of 18973039 is about 266.7138897272.

The spelling of 18973039 in words is "eighteen million, nine hundred seventy-three thousand, thirty-nine".