1916609 has 4 divisors (see below), whose sum is σ = 1927380. Its totient is φ = 1905840.

The previous prime is 1916599. The next prime is 1916611. The reversal of 1916609 is 9066191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9066191 = 151 ⋅60041.

It can be written as a sum of positive squares in 2 ways, for example, as 107584 + 1809025 = 328^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916609 - 2⁸ = 1916353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1916689) 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, 5114 + ... + 5475.

It is an arithmetic number, because the mean of its divisors is an integer number (481845).

2^1916609 is an apocalyptic number.

It is an amenable number.

1916609 is a deficient number, since it is larger than the sum of its proper divisors (10771).

1916609 is a wasteful number, since it uses less digits than its factorization.

1916609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10770.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1916609 is about 1384.4164835771. The cubic root of 1916609 is about 124.2160861090.

The spelling of 1916609 in words is "one million, nine hundred sixteen thousand, six hundred nine".