16668387 has 12 divisors (see below), whose sum is σ = 24311664. Its totient is φ = 11003760.

The previous prime is 16668361. The next prime is 16668401. The reversal of 16668387 is 78386661.

It is not a de Polignac number, because 16668387 - 2²² = 12474083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16668317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8064 + ... + 9917.

It is an arithmetic number, because the mean of its divisors is an integer number (2025972).

Almost surely, 2^16668387 is an apocalyptic number.

16668387 is a deficient number, since it is larger than the sum of its proper divisors (7643277).

16668387 is a wasteful number, since it uses less digits than its factorization.

16668387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18090 (or 18087 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 16668387 is about 4082.6935961446. The cubic root of 16668387 is about 255.4452658799.

The spelling of 16668387 in words is "sixteen million, six hundred sixty-eight thousand, three hundred eighty-seven".