18949481 has 4 divisors (see below), whose sum is σ = 19177872. Its totient is φ = 18721092.

The previous prime is 18949471. The next prime is 18949487. The reversal of 18949481 is 18494981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18949481 - 2⁶ = 18949417 is a prime.

It is a super-2 number, since 2×18949481² = 718165660338722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18949487) 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, 114071 + ... + 114236.

It is an arithmetic number, because the mean of its divisors is an integer number (4794468).

Almost surely, 2^18949481 is an apocalyptic number.

It is an amenable number.

18949481 is a deficient number, since it is larger than the sum of its proper divisors (228391).

18949481 is an equidigital number, since it uses as much as digits as its factorization.

18949481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228390.

The product of its digits is 82944, while the sum is 44.

The square root of 18949481 is about 4353.1001596563. The cubic root of 18949481 is about 266.6034549825.

The spelling of 18949481 in words is "eighteen million, nine hundred forty-nine thousand, four hundred eighty-one".