18922709 has 8 divisors (see below), whose sum is σ = 20852832. Its totient is φ = 17060400.

The previous prime is 18922699. The next prime is 18922723. The reversal of 18922709 is 90722981.

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-18922709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18922759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16367 + ... + 17484.

It is an arithmetic number, because the mean of its divisors is an integer number (2606604).

Almost surely, 2^18922709 is an apocalyptic number.

It is an amenable number.

18922709 is a deficient number, since it is larger than the sum of its proper divisors (1930123).

18922709 is a wasteful number, since it uses less digits than its factorization.

18922709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33907.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 18922709 is about 4350.0240229222. The cubic root of 18922709 is about 266.4778425423.

The spelling of 18922709 in words is "eighteen million, nine hundred twenty-two thousand, seven hundred nine".