18699307 has 4 divisors (see below), whose sum is σ = 20399256. Its totient is φ = 16999360.

The previous prime is 18699259. The next prime is 18699311. The reversal of 18699307 is 70399681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70399681 = 11 ⋅6399971.

It is a cyclic number.

It is not a de Polignac number, because 18699307 - 2¹⁹ = 18175019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18699347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 849958 + ... + 849979.

It is an arithmetic number, because the mean of its divisors is an integer number (5099814).

Almost surely, 2^18699307 is an apocalyptic number.

18699307 is a deficient number, since it is larger than the sum of its proper divisors (1699949).

18699307 is a wasteful number, since it uses less digits than its factorization.

18699307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699948.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 18699307 is about 4324.2695336901. The cubic root of 18699307 is about 265.4250068670.

The spelling of 18699307 in words is "eighteen million, six hundred ninety-nine thousand, three hundred seven".