18340426 has 16 divisors (see below), whose sum is σ = 29822184. Its totient is φ = 8409024.

The previous prime is 18340423. The next prime is 18340429. The reversal of 18340426 is 62404381.

It is an interprime number because it is at equal distance from previous prime (18340423) and next prime (18340429).

It can be written as a sum of positive squares in 4 ways, for example, as 16394401 + 1946025 = 4049^2 + 1395^2 .

It is a super-2 number, since 2×18340426² = 672742451722952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18340394 and 18340403.

It is not an unprimeable number, because it can be changed into a prime (18340423) 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 7 ways as a sum of consecutive naturals, for example, 1836 + ... + 6328.

Almost surely, 2^18340426 is an apocalyptic number.

18340426 is a deficient number, since it is larger than the sum of its proper divisors (11481758).

18340426 is a wasteful number, since it uses less digits than its factorization.

18340426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4665.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 18340426 is about 4282.5723578242. The cubic root of 18340426 is about 263.7159958558.

The spelling of 18340426 in words is "eighteen million, three hundred forty thousand, four hundred twenty-six".