18691941 has 8 divisors (see below), whose sum is σ = 25530624. Its totient is φ = 12157280.

The previous prime is 18691931. The next prime is 18691961. The reversal of 18691941 is 14919681.

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

It is a cyclic number.

It is not a de Polignac number, because 18691941 - 2⁵ = 18691909 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18691941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18691931) 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, 75861 + ... + 76106.

It is an arithmetic number, because the mean of its divisors is an integer number (3191328).

Almost surely, 2^18691941 is an apocalyptic number.

It is an amenable number.

18691941 is a deficient number, since it is larger than the sum of its proper divisors (6838683).

18691941 is a wasteful number, since it uses less digits than its factorization.

18691941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152011.

The product of its digits is 15552, while the sum is 39.

The square root of 18691941 is about 4323.4177452566. The cubic root of 18691941 is about 265.3901503636.

The spelling of 18691941 in words is "eighteen million, six hundred ninety-one thousand, nine hundred forty-one".