1660099 has 4 divisors (see below), whose sum is σ = 1897264. Its totient is φ = 1422936.

The previous prime is 1660097. The next prime is 1660103. The reversal of 1660099 is 9900661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1660099 - 2¹ = 1660097 is a prime.

It is a Duffinian number.

1660099 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1660099.

It is not an unprimeable number, because it can be changed into a prime (1660097) 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, 118572 + ... + 118585.

It is an arithmetic number, because the mean of its divisors is an integer number (474316).

2^1660099 is an apocalyptic number.

1660099 is a deficient number, since it is larger than the sum of its proper divisors (237165).

1660099 is an equidigital number, since it uses as much as digits as its factorization.

1660099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237164.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 1660099 is about 1288.4482915507. The cubic root of 1660099 is about 118.4071685382.

The spelling of 1660099 in words is "one million, six hundred sixty thousand, ninety-nine".