1851994 has 4 divisors (see below), whose sum is σ = 2777994. Its totient is φ = 925996.

The previous prime is 1851991. The next prime is 1852003. The reversal of 1851994 is 4991581.

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

It can be written as a sum of positive squares in only one way, i.e., 1476225 + 375769 = 1215^2 + 613^2 .

It is not an unprimeable number, because it can be changed into a prime (1851991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 462997 + ... + 463000.

2^1851994 is an apocalyptic number.

1851994 is a deficient number, since it is larger than the sum of its proper divisors (926000).

1851994 is an equidigital number, since it uses as much as digits as its factorization.

1851994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925999.

The product of its digits is 12960, while the sum is 37.

The square root of 1851994 is about 1360.8798624419. The cubic root of 1851994 is about 122.8041919438.

The spelling of 1851994 in words is "one million, eight hundred fifty-one thousand, nine hundred ninety-four".