18729693 has 12 divisors (see below), whose sum is σ = 27095068. Its totient is φ = 12467520.

The previous prime is 18729691. The next prime is 18729703. The reversal of 18729693 is 39692781.

It can be written as a sum of positive squares in 2 ways, for example, as 5963364 + 12766329 = 2442^2 + 3573^2 .

It is not a de Polignac number, because 18729693 - 2¹ = 18729691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18729691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7323 + ... + 9543.

Almost surely, 2^18729693 is an apocalyptic number.

It is an amenable number.

18729693 is a deficient number, since it is larger than the sum of its proper divisors (8365375).

18729693 is a wasteful number, since it uses less digits than its factorization.

18729693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3164 (or 3161 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 18729693 is about 4327.7815333032. The cubic root of 18729693 is about 265.5686991725.

The spelling of 18729693 in words is "eighteen million, seven hundred twenty-nine thousand, six hundred ninety-three".