180349993 has 4 divisors (see below), whose sum is σ = 180377028. Its totient is φ = 180322960.

The previous prime is 180349987. The next prime is 180349999. The reversal of 180349993 is 399943081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (180349987) and next prime (180349999).

It can be written as a sum of positive squares in 2 ways, for example, as 173396224 + 6953769 = 13168^2 + 2637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180349993 is a prime.

It is a super-2 number, since 2×180349993² = 65052239950200098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180349999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4455 + ... + 19507.

It is an arithmetic number, because the mean of its divisors is an integer number (45094257).

Almost surely, 2^180349993 is an apocalyptic number.

It is an amenable number.

180349993 is a deficient number, since it is larger than the sum of its proper divisors (27035).

180349993 is a wasteful number, since it uses less digits than its factorization.

180349993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27034.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 180349993 is about 13429.4449997012. Note that the first 3 decimals coincide. The cubic root of 180349993 is about 564.9873315352.

The spelling of 180349993 in words is "one hundred eighty million, three hundred forty-nine thousand, nine hundred ninety-three".