1810994 has 4 divisors (see below), whose sum is σ = 2716494. Its totient is φ = 905496.

The previous prime is 1810981. The next prime is 1810999. The reversal of 1810994 is 4990181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4990181 = 7 ⋅712883.

It can be written as a sum of positive squares in only one way, i.e., 1723969 + 87025 = 1313^2 + 295^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1810994.

It is not an unprimeable number, because it can be changed into a prime (1810999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452747 + ... + 452750.

2^1810994 is an apocalyptic number.

1810994 is a deficient number, since it is larger than the sum of its proper divisors (905500).

1810994 is an equidigital number, since it uses as much as digits as its factorization.

1810994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905499.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1810994 is about 1345.7317711937. The cubic root of 1810994 is about 121.8911956562.

The spelling of 1810994 in words is "one million, eight hundred ten thousand, nine hundred ninety-four".