1971938 has 4 divisors (see below), whose sum is σ = 2957910. Its totient is φ = 985968.

The previous prime is 1971911. The next prime is 1971967. The reversal of 1971938 is 8391791.

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., 1352569 + 619369 = 1163^2 + 787^2 .

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, 492983 + ... + 492986.

2^1971938 is an apocalyptic number.

1971938 is a deficient number, since it is larger than the sum of its proper divisors (985972).

1971938 is an equidigital number, since it uses as much as digits as its factorization.

1971938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985971.

The product of its digits is 13608, while the sum is 38.

The square root of 1971938 is about 1404.2570989673. The cubic root of 1971938 is about 125.4000622357.

The spelling of 1971938 in words is "one million, nine hundred seventy-one thousand, nine hundred thirty-eight".