1609994 has 4 divisors (see below), whose sum is σ = 2414994. Its totient is φ = 804996.

The previous prime is 1609991. The next prime is 1609997. The reversal of 1609994 is 4999061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4999061 = 47 ⋅106363.

It is an interprime number because it is at equal distance from previous prime (1609991) and next prime (1609997).

It can be written as a sum of positive squares in only one way, i.e., 1575025 + 34969 = 1255^2 + 187^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1609991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402497 + ... + 402500.

2^1609994 is an apocalyptic number.

1609994 is a deficient number, since it is larger than the sum of its proper divisors (805000).

1609994 is an equidigital number, since it uses as much as digits as its factorization.

1609994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804999.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 1609994 is about 1268.8553897115. The cubic root of 1609994 is about 117.2037261917.

The spelling of 1609994 in words is "one million, six hundred nine thousand, nine hundred ninety-four".