1971942394 has 8 divisors (see below), whose sum is σ = 2959304148. Its totient is φ = 985507680.

The previous prime is 1971942389. The next prime is 1971942439. The reversal of 1971942394 is 4932491791.

It can be written as a sum of positive squares in 2 ways, for example, as 1805145169 + 166797225 = 42487^2 + 12915^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226417 + ... + 234964.

Almost surely, 2^1971942394 is an apocalyptic number.

1971942394 is a deficient number, since it is larger than the sum of its proper divisors (987361754).

1971942394 is a wasteful number, since it uses less digits than its factorization.

1971942394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463520.

The product of its digits is 489888, while the sum is 49.

The square root of 1971942394 is about 44406.5580066728. The cubic root of 1971942394 is about 1254.0015537713.

The spelling of 1971942394 in words is "one billion, nine hundred seventy-one million, nine hundred forty-two thousand, three hundred ninety-four".