18780797 has 8 divisors (see below), whose sum is σ = 22593600. Its totient is φ = 15250464.

The previous prime is 18780791. The next prime is 18780799. The reversal of 18780797 is 79708781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18780797 - 2¹⁰ = 18779773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18780791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70472 + ... + 70737.

It is an arithmetic number, because the mean of its divisors is an integer number (2824200).

Almost surely, 2^18780797 is an apocalyptic number.

It is an amenable number.

18780797 is a deficient number, since it is larger than the sum of its proper divisors (3812803).

18780797 is a wasteful number, since it uses less digits than its factorization.

18780797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141235.

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 18780797 is about 4333.6816911259. The cubic root of 18780797 is about 265.8100147150.

The spelling of 18780797 in words is "eighteen million, seven hundred eighty thousand, seven hundred ninety-seven".