73438181 has 4 divisors (see below), whose sum is σ = 77758092. Its totient is φ = 69118272.

The previous prime is 73438177. The next prime is 73438201. The reversal of 73438181 is 18183437.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49477156 + 23961025 = 7034^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 73438181 - 2² = 73438177 is a prime.

It is a super-2 number, since 2×73438181² = 10786332857177522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73438381) 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, 2159930 + ... + 2159963.

It is an arithmetic number, because the mean of its divisors is an integer number (19439523).

Almost surely, 2^73438181 is an apocalyptic number.

It is an amenable number.

73438181 is a deficient number, since it is larger than the sum of its proper divisors (4319911).

73438181 is a wasteful number, since it uses less digits than its factorization.

73438181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4319910.

The product of its digits is 16128, while the sum is 35.

The square root of 73438181 is about 8569.6079840329. The cubic root of 73438181 is about 418.7684653326.

The spelling of 73438181 in words is "seventy-three million, four hundred thirty-eight thousand, one hundred eighty-one".