16665387 has 8 divisors (see below), whose sum is σ = 22250640. Its totient is φ = 11095200.

The previous prime is 16665377. The next prime is 16665403. The reversal of 16665387 is 78356661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16665387 - 2⁴ = 16665371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16665347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 864 + ... + 5837.

It is an arithmetic number, because the mean of its divisors is an integer number (2781330).

Almost surely, 2^16665387 is an apocalyptic number.

16665387 is a deficient number, since it is larger than the sum of its proper divisors (5585253).

16665387 is an equidigital number, since it uses as much as digits as its factorization.

16665387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7533.

The product of its digits is 181440, while the sum is 42.

The square root of 16665387 is about 4082.3261751114. The cubic root of 16665387 is about 255.4299398263.

The spelling of 16665387 in words is "sixteen million, six hundred sixty-five thousand, three hundred eighty-seven".