18215430937 has 4 divisors (see below), whose sum is σ = 19871379216. Its totient is φ = 16559482660.

The previous prime is 18215430931. The next prime is 18215430953. The reversal of 18215430937 is 73903451281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73903451281 = 11 ⋅6718495571.

It is a cyclic number.

It is not a de Polignac number, because 18215430937 - 2³¹ = 16067947289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18215430893 and 18215430902.

It is not an unprimeable number, because it can be changed into a prime (18215430931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827974123 + ... + 827974144.

It is an arithmetic number, because the mean of its divisors is an integer number (4967844804).

Almost surely, 2^18215430937 is an apocalyptic number.

It is an amenable number.

18215430937 is a deficient number, since it is larger than the sum of its proper divisors (1655948279).

18215430937 is a wasteful number, since it uses less digits than its factorization.

18215430937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655948278.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 18215430937 in words is "eighteen billion, two hundred fifteen million, four hundred thirty thousand, nine hundred thirty-seven".