18420034 has 4 divisors (see below), whose sum is σ = 27630054. Its totient is φ = 9210016.

The previous prime is 18420011. The next prime is 18420047. The reversal of 18420034 is 43002481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16605625 + 1814409 = 4075^2 + 1347^2 .

It is a super-2 number, since 2×18420034² = 678595305122312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18419987 and 18420014.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4605007 + ... + 4605010.

Almost surely, 2^18420034 is an apocalyptic number.

18420034 is a deficient number, since it is larger than the sum of its proper divisors (9210020).

18420034 is an equidigital number, since it uses as much as digits as its factorization.

18420034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210019.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 18420034 is about 4291.8567077665. The cubic root of 18420034 is about 264.0970048325.

The spelling of 18420034 in words is "eighteen million, four hundred twenty thousand, thirty-four".