18780844 has 12 divisors (see below), whose sum is σ = 32896864. Its totient is φ = 9381744.

The previous prime is 18780833. The next prime is 18780847. The reversal of 18780844 is 44808781.

It is a junction number, because it is equal to n+sod(n) for n = 18780797 and 18780806.

It is not an unprimeable number, because it can be changed into a prime (18780847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7069 + ... + 9355.

Almost surely, 2^18780844 is an apocalyptic number.

It is an amenable number.

18780844 is a deficient number, since it is larger than the sum of its proper divisors (14116020).

18780844 is a wasteful number, since it uses less digits than its factorization.

18780844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4344 (or 4342 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 18780844 is about 4333.6871137635. The cubic root of 18780844 is about 265.8102364496.

The spelling of 18780844 in words is "eighteen million, seven hundred eighty thousand, eight hundred forty-four".