18876649 has 4 divisors (see below), whose sum is σ = 20592720. Its totient is φ = 17160580.

The previous prime is 18876631. The next prime is 18876659. The reversal of 18876649 is 94667881.

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 18876649 - 2⁷ = 18876521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18876659) 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, 858019 + ... + 858040.

It is an arithmetic number, because the mean of its divisors is an integer number (5148180).

Almost surely, 2^18876649 is an apocalyptic number.

It is an amenable number.

18876649 is a deficient number, since it is larger than the sum of its proper divisors (1716071).

18876649 is a wasteful number, since it uses less digits than its factorization.

18876649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716070.

The product of its digits is 580608, while the sum is 49.

The square root of 18876649 is about 4344.7265736753. The cubic root of 18876649 is about 266.2614545389.

The spelling of 18876649 in words is "eighteen million, eight hundred seventy-six thousand, six hundred forty-nine".