18915849 has 48 divisors (see below), whose sum is σ = 31711680. Its totient is φ = 11197440.

The previous prime is 18915823. The next prime is 18915851. The reversal of 18915849 is 94851981.

18915849 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 18915849 - 2⁵ = 18915817 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18915649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78369 + ... + 78609.

It is an arithmetic number, because the mean of its divisors is an integer number (660660).

Almost surely, 2^18915849 is an apocalyptic number.

18915849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18915849 is a deficient number, since it is larger than the sum of its proper divisors (12795831).

18915849 is a wasteful number, since it uses less digits than its factorization.

18915849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 280 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 18915849 is about 4349.2354500533. The cubic root of 18915849 is about 266.4456368127.

The spelling of 18915849 in words is "eighteen million, nine hundred fifteen thousand, eight hundred forty-nine".