18861429 has 8 divisors (see below), whose sum is σ = 25683840. Its totient is φ = 12306656.

The previous prime is 18861421. The next prime is 18861439. The reversal of 18861429 is 92416881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18861429 - 2³ = 18861421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861421) 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, 66744 + ... + 67025.

It is an arithmetic number, because the mean of its divisors is an integer number (3210480).

Almost surely, 2^18861429 is an apocalyptic number.

It is an amenable number.

18861429 is a deficient number, since it is larger than the sum of its proper divisors (6822411).

18861429 is a wasteful number, since it uses less digits than its factorization.

18861429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133819.

The product of its digits is 27648, while the sum is 39.

The square root of 18861429 is about 4342.9746718119. The cubic root of 18861429 is about 266.1898742320.

The spelling of 18861429 in words is "eighteen million, eight hundred sixty-one thousand, four hundred twenty-nine".