1971994 has 4 divisors (see below), whose sum is σ = 2957994. Its totient is φ = 985996.

The previous prime is 1971967. The next prime is 1972007. The reversal of 1971994 is 4991791.

It is a happy number.

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., 1311025 + 660969 = 1145^2 + 813^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492997 + ... + 493000.

2^1971994 is an apocalyptic number.

1971994 is a deficient number, since it is larger than the sum of its proper divisors (986000).

1971994 is an equidigital number, since it uses as much as digits as its factorization.

1971994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985999.

The product of its digits is 20412, while the sum is 40.

The square root of 1971994 is about 1404.2770381944. The cubic root of 1971994 is about 125.4012492806.

The spelling of 1971994 in words is "one million, nine hundred seventy-one thousand, nine hundred ninety-four".