181413938 has 8 divisors (see below), whose sum is σ = 286443120. Its totient is φ = 85932900.

The previous prime is 181413931. The next prime is 181413943. The reversal of 181413938 is 839314181.

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

It is a super-2 number, since 2×181413938² = 65822033801335688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 4774051 = 181413938 / (1 + 8 + 1 + 4 + 1 + 3 + 9 + 3 + 8).

It is not an unprimeable number, because it can be changed into a prime (181413931) 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, 2386988 + ... + 2387063.

It is an arithmetic number, because the mean of its divisors is an integer number (35805390).

Almost surely, 2^181413938 is an apocalyptic number.

181413938 is a deficient number, since it is larger than the sum of its proper divisors (105029182).

181413938 is a wasteful number, since it uses less digits than its factorization.

181413938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774072.

The product of its digits is 20736, while the sum is 38.

The square root of 181413938 is about 13468.9991461875. Note that the first 3 decimals coincide. The cubic root of 181413938 is about 566.0961704008.

The spelling of 181413938 in words is "one hundred eighty-one million, four hundred thirteen thousand, nine hundred thirty-eight".