18689307 has 32 divisors (see below), whose sum is σ = 32481792. Its totient is φ = 9275904.

The previous prime is 18689291. The next prime is 18689323. The reversal of 18689307 is 70398681.

It is an interprime number because it is at equal distance from previous prime (18689291) and next prime (18689323).

It is not a de Polignac number, because 18689307 - 2⁴ = 18689291 is a prime.

It is a super-2 number, since 2×18689307² = 698580392280498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18689347) 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 31 ways as a sum of consecutive naturals, for example, 2628 + ... + 6654.

It is an arithmetic number, because the mean of its divisors is an integer number (1015056).

Almost surely, 2^18689307 is an apocalyptic number.

18689307 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18689307 is a deficient number, since it is larger than the sum of its proper divisors (13792485).

18689307 is a wasteful number, since it uses less digits than its factorization.

18689307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18689307 is about 4323.1131144119. The cubic root of 18689307 is about 265.3776838414.

It can be divided in two parts, 1868 and 9307, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 18689307 in words is "eighteen million, six hundred eighty-nine thousand, three hundred seven".