18343481 has 4 divisors (see below), whose sum is σ = 19754532. Its totient is φ = 16932432.

The previous prime is 18343477. The next prime is 18343483. The reversal of 18343481 is 18434381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18434381 = 7 ⋅2633483.

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 8357881 = 3160^2 + 2891^2 .

It is a cyclic number.

It is not a de Polignac number, because 18343481 - 2² = 18343477 is a prime.

It is a super-2 number, since 2×18343481² = 672966590394722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18343483) 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, 705506 + ... + 705531.

It is an arithmetic number, because the mean of its divisors is an integer number (4938633).

Almost surely, 2^18343481 is an apocalyptic number.

It is an amenable number.

18343481 is a deficient number, since it is larger than the sum of its proper divisors (1411051).

18343481 is a wasteful number, since it uses less digits than its factorization.

18343481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411050.

The product of its digits is 9216, while the sum is 32.

The square root of 18343481 is about 4282.9290211256. The cubic root of 18343481 is about 263.7306376029.

The spelling of 18343481 in words is "eighteen million, three hundred forty-three thousand, four hundred eighty-one".