1978101994 has 8 divisors (see below), whose sum is σ = 3236894208. Its totient is φ = 899137260.

The previous prime is 1978101973. The next prime is 1978102013. The reversal of 1978101994 is 4991018791.

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, 44956842 + ... + 44956885.

It is an arithmetic number, because the mean of its divisors is an integer number (404611776).

Almost surely, 2^1978101994 is an apocalyptic number.

1978101994 is a deficient number, since it is larger than the sum of its proper divisors (1258792214).

1978101994 is a wasteful number, since it uses less digits than its factorization.

1978101994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89913740.

The product of its (nonzero) digits is 163296, while the sum is 49.

The square root of 1978101994 is about 44475.8585527025. The cubic root of 1978101994 is about 1255.3058717010.

The spelling of 1978101994 in words is "one billion, nine hundred seventy-eight million, one hundred one thousand, nine hundred ninety-four".