18798949 has 4 divisors (see below), whose sum is σ = 20245036. Its totient is φ = 17352864.

The previous prime is 18798943. The next prime is 18798971. The reversal of 18798949 is 94989781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3038049 + 15760900 = 1743^2 + 3970^2 .

It is a cyclic number.

It is not a de Polignac number, because 18798949 - 2¹³ = 18790757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18798949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18798943) 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, 723024 + ... + 723049.

It is an arithmetic number, because the mean of its divisors is an integer number (5061259).

Almost surely, 2^18798949 is an apocalyptic number.

It is an amenable number.

18798949 is a deficient number, since it is larger than the sum of its proper divisors (1446087).

18798949 is a wasteful number, since it uses less digits than its factorization.

18798949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446086.

The product of its digits is 1306368, while the sum is 55.

The square root of 18798949 is about 4335.7754785044. The cubic root of 18798949 is about 265.8956239633.

The spelling of 18798949 in words is "eighteen million, seven hundred ninety-eight thousand, nine hundred forty-nine".