18380029 has 4 divisors (see below), whose sum is σ = 18726876. Its totient is φ = 18033184.

The previous prime is 18380027. The next prime is 18380053. The reversal of 18380029 is 92008381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92008381 = 37 ⋅2486713.

It can be written as a sum of positive squares in 2 ways, for example, as 5405625 + 12974404 = 2325^2 + 3602^2 .

It is a cyclic number.

It is not a de Polignac number, because 18380029 - 2¹ = 18380027 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 (18380027) 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, 173344 + ... + 173449.

It is an arithmetic number, because the mean of its divisors is an integer number (4681719).

Almost surely, 2^18380029 is an apocalyptic number.

It is an amenable number.

18380029 is a deficient number, since it is larger than the sum of its proper divisors (346847).

18380029 is an equidigital number, since it uses as much as digits as its factorization.

18380029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346846.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18380029 is about 4287.1936042124. The cubic root of 18380029 is about 263.9056758608.

The spelling of 18380029 in words is "eighteen million, three hundred eighty thousand, twenty-nine".