18394434370 has 16 divisors (see below), whose sum is σ = 35656903800. Its totient is φ = 6791791104.

The previous prime is 18394434343. The next prime is 18394434371. The reversal of 18394434370 is 7343449381.

It can be written as a sum of positive squares in 4 ways, for example, as 17067070881 + 1327363489 = 130641^2 + 36433^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18394434370.

It is not an unprimeable number, because it can be changed into a prime (18394434371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70747695 + ... + 70747954.

Almost surely, 2^18394434370 is an apocalyptic number.

18394434370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18394434370 is a deficient number, since it is larger than the sum of its proper divisors (17262469430).

18394434370 is a wasteful number, since it uses less digits than its factorization.

18394434370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141495669.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 18394434370 in words is "eighteen billion, three hundred ninety-four million, four hundred thirty-four thousand, three hundred seventy".