18780313 has 8 divisors (see below), whose sum is σ = 19499400. Its totient is φ = 18066048.

The previous prime is 18780271. The next prime is 18780329. The reversal of 18780313 is 31308781.

It can be written as a sum of positive squares in 4 ways, for example, as 350464 + 18429849 = 592^2 + 4293^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18780313 - 2¹³ = 18772121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18780383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8043 + ... + 10111.

It is an arithmetic number, because the mean of its divisors is an integer number (2437425).

Almost surely, 2^18780313 is an apocalyptic number.

It is an amenable number.

18780313 is a deficient number, since it is larger than the sum of its proper divisors (719087).

18780313 is a wasteful number, since it uses less digits than its factorization.

18780313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18780313 is about 4333.6258491014. The cubic root of 18780313 is about 265.8077312984.

The spelling of 18780313 in words is "eighteen million, seven hundred eighty thousand, three hundred thirteen".