18750643 has 4 divisors (see below), whose sum is σ = 19853640. Its totient is φ = 17647648.

The previous prime is 18750637. The next prime is 18750649. The reversal of 18750643 is 34605781.

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

It is an interprime number because it is at equal distance from previous prime (18750637) and next prime (18750649).

It is a cyclic number.

It is not a de Polignac number, because 18750643 - 2¹⁷ = 18619571 is a prime.

It is a super-2 number, since 2×18750643² = 703173225826898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18750599 and 18750608.

It is not an unprimeable number, because it can be changed into a prime (18750649) 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, 551473 + ... + 551506.

It is an arithmetic number, because the mean of its divisors is an integer number (4963410).

Almost surely, 2^18750643 is an apocalyptic number.

18750643 is a deficient number, since it is larger than the sum of its proper divisors (1102997).

18750643 is a wasteful number, since it uses less digits than its factorization.

18750643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102996.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 18750643 is about 4330.2012655303. The cubic root of 18750643 is about 265.6676791030.

The spelling of 18750643 in words is "eighteen million, seven hundred fifty thousand, six hundred forty-three".