18701229 has 4 divisors (see below), whose sum is σ = 24934976. Its totient is φ = 12467484.

The previous prime is 18701203. The next prime is 18701237. The reversal of 18701229 is 92210781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18701229 - 2¹⁶ = 18635693 is a prime.

It is a super-2 number, since 2×18701229² = 699471932220882, 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 = 18701196 and 18701205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18701729) 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, 3116869 + ... + 3116874.

It is an arithmetic number, because the mean of its divisors is an integer number (6233744).

Almost surely, 2^18701229 is an apocalyptic number.

It is an amenable number.

18701229 is a deficient number, since it is larger than the sum of its proper divisors (6233747).

18701229 is an equidigital number, since it uses as much as digits as its factorization.

18701229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6233746.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 18701229 is about 4324.4917620456. The cubic root of 18701229 is about 265.4341004195.

The spelling of 18701229 in words is "eighteen million, seven hundred one thousand, two hundred twenty-nine".