18280640434 has 16 divisors (see below), whose sum is σ = 31375612800. Its totient is φ = 7825217184.

The previous prime is 18280640401. The next prime is 18280640473. The reversal of 18280640434 is 43404608281.

It is a happy number.

It is an unprimeable number.

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, 766419 + ... + 789910.

It is an arithmetic number, because the mean of its divisors is an integer number (1960975800).

Almost surely, 2^18280640434 is an apocalyptic number.

18280640434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18280640434 is a deficient number, since it is larger than the sum of its proper divisors (13094972366).

18280640434 is a wasteful number, since it uses less digits than its factorization.

18280640434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557177.

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 18280640434 in words is "eighteen billion, two hundred eighty million, six hundred forty thousand, four hundred thirty-four".