18780941 has 4 divisors (see below), whose sum is σ = 19288572. Its totient is φ = 18273312.

The previous prime is 18780901. The next prime is 18780943. The reversal of 18780941 is 14908781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17255716 + 1525225 = 4154^2 + 1235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18780941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18780895 and 18780904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18780943) 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, 253760 + ... + 253833.

It is an arithmetic number, because the mean of its divisors is an integer number (4822143).

Almost surely, 2^18780941 is an apocalyptic number.

It is an amenable number.

18780941 is a deficient number, since it is larger than the sum of its proper divisors (507631).

18780941 is an equidigital number, since it uses as much as digits as its factorization.

18780941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507630.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18780941 is about 4333.6983051431. The cubic root of 18780941 is about 265.8106940710.

The spelling of 18780941 in words is "eighteen million, seven hundred eighty thousand, nine hundred forty-one".