1684994 has 4 divisors (see below), whose sum is σ = 2527494. Its totient is φ = 842496.

The previous prime is 1684993. The next prime is 1684999. The reversal of 1684994 is 4994861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4994861 = 239 ⋅20899.

It can be written as a sum of positive squares in only one way, i.e., 1129969 + 555025 = 1063^2 + 745^2 .

It is not an unprimeable number, because it can be changed into a prime (1684993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421247 + ... + 421250.

2^1684994 is an apocalyptic number.

1684994 is a deficient number, since it is larger than the sum of its proper divisors (842500).

1684994 is an equidigital number, since it uses as much as digits as its factorization.

1684994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842499.

The product of its digits is 62208, while the sum is 41.

The square root of 1684994 is about 1298.0731874590. The cubic root of 1684994 is about 118.9961159667.

The spelling of 1684994 in words is "one million, six hundred eighty-four thousand, nine hundred ninety-four".