18815398373 has 8 divisors (see below), whose sum is σ = 19061664120. Its totient is φ = 18570308800.

The previous prime is 18815398367. The next prime is 18815398387. The reversal of 18815398373 is 37389351881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 876278404 + 17939119969 = 29602^2 + 133937^2 .

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 18815398373 - 2¹² = 18815394277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18815398313) 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 7 ways as a sum of consecutive naturals, for example, 261818 + ... + 325851.

It is an arithmetic number, because the mean of its divisors is an integer number (2382708015).

Almost surely, 2^18815398373 is an apocalyptic number.

It is an amenable number.

18815398373 is a deficient number, since it is larger than the sum of its proper divisors (246265747).

18815398373 is a wasteful number, since it uses less digits than its factorization.

18815398373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588087.

The product of its digits is 4354560, while the sum is 56.

The spelling of 18815398373 in words is "eighteen billion, eight hundred fifteen million, three hundred ninety-eight thousand, three hundred seventy-three".