18740405386 has 16 divisors (see below), whose sum is σ = 29414907648. Its totient is φ = 8943717600.

The previous prime is 18740405377. The next prime is 18740405393. The reversal of 18740405386 is 68350404781.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2065780 + ... + 2074831.

It is an arithmetic number, because the mean of its divisors is an integer number (1838431728).

Almost surely, 2^18740405386 is an apocalyptic number.

18740405386 is a deficient number, since it is larger than the sum of its proper divisors (10674502262).

18740405386 is a wasteful number, since it uses less digits than its factorization.

18740405386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140717.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 18740405386 in words is "eighteen billion, seven hundred forty million, four hundred five thousand, three hundred eighty-six".