18972941 has 4 divisors (see below), whose sum is σ = 20432412. Its totient is φ = 17513472.

The previous prime is 18972937. The next prime is 18972973. The reversal of 18972941 is 14927981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14927981 = 61 ⋅244721.

It can be written as a sum of positive squares in 2 ways, for example, as 3204100 + 15768841 = 1790^2 + 3971^2 .

It is a cyclic number.

It is not a de Polignac number, because 18972941 - 2² = 18972937 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18972991) 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, 729716 + ... + 729741.

It is an arithmetic number, because the mean of its divisors is an integer number (5108103).

Almost surely, 2^18972941 is an apocalyptic number.

It is an amenable number.

18972941 is a deficient number, since it is larger than the sum of its proper divisors (1459471).

18972941 is a wasteful number, since it uses less digits than its factorization.

18972941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459470.

The product of its digits is 36288, while the sum is 41.

The square root of 18972941 is about 4355.7939574778. The cubic root of 18972941 is about 266.7134305141.

The spelling of 18972941 in words is "eighteen million, nine hundred seventy-two thousand, nine hundred forty-one".