18693649 has 16 divisors (see below), whose sum is σ = 20684160. Its totient is φ = 16790400.

The previous prime is 18693643. The next prime is 18693667. The reversal of 18693649 is 94639681.

It is a cyclic number.

It is not a de Polignac number, because 18693649 - 2¹¹ = 18691601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18693599 and 18693608.

It is not an unprimeable number, because it can be changed into a prime (18693643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123724 + ... + 123874.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^18693649 is an apocalyptic number.

It is an amenable number.

18693649 is a deficient number, since it is larger than the sum of its proper divisors (1990511).

18693649 is a wasteful number, since it uses less digits than its factorization.

18693649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360.

The product of its digits is 279936, while the sum is 46.

The square root of 18693649 is about 4323.6152696557. The cubic root of 18693649 is about 265.3982335721.

The spelling of 18693649 in words is "eighteen million, six hundred ninety-three thousand, six hundred forty-nine".