18906849 has 24 divisors (see below), whose sum is σ = 29975400. Its totient is φ = 11411712.

The previous prime is 18906847. The next prime is 18906913. The reversal of 18906849 is 94860981.

It can be written as a sum of positive squares in 4 ways, for example, as 140625 + 18766224 = 375^2 + 4332^2 .

It is not a de Polignac number, because 18906849 - 2¹ = 18906847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18906841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4677 + ... + 7725.

It is an arithmetic number, because the mean of its divisors is an integer number (1248975).

Almost surely, 2^18906849 is an apocalyptic number.

It is an amenable number.

18906849 is a deficient number, since it is larger than the sum of its proper divisors (11068551).

18906849 is a wasteful number, since it uses less digits than its factorization.

18906849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121 (or 3118 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18906849 is about 4348.2006623430. The cubic root of 18906849 is about 266.4033725867.

The spelling of 18906849 in words is "eighteen million, nine hundred six thousand, eight hundred forty-nine".