18980671 has 4 divisors (see below), whose sum is σ = 18990000. Its totient is φ = 18971344.

The previous prime is 18980659. The next prime is 18980683. The reversal of 18980671 is 17608981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (18980659) and next prime (18980683).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18980671 is a prime.

It is a super-2 number, since 2×18980671² = 720531743220482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18984671) 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, 166 + ... + 6163.

It is an arithmetic number, because the mean of its divisors is an integer number (4747500).

Almost surely, 2^18980671 is an apocalyptic number.

18980671 is a deficient number, since it is larger than the sum of its proper divisors (9329).

18980671 is an equidigital number, since it uses as much as digits as its factorization.

18980671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9328.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18980671 is about 4356.6811909985. The cubic root of 18980671 is about 266.7496472659.

The spelling of 18980671 in words is "eighteen million, nine hundred eighty thousand, six hundred seventy-one".