1978141439 has 8 divisors (see below), whose sum is σ = 2024491920. Its totient is φ = 1932218496.

The previous prime is 1978141411. The next prime is 1978141447. The reversal of 1978141439 is 9341418791.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1978141439 - 2⁸ = 1978141183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1978141393 and 1978141402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978141469) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 97514 + ... + 116039.

It is an arithmetic number, because the mean of its divisors is an integer number (253061490).

Almost surely, 2^1978141439 is an apocalyptic number.

1978141439 is a deficient number, since it is larger than the sum of its proper divisors (46350481).

1978141439 is a wasteful number, since it uses less digits than its factorization.

1978141439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213769.

The product of its digits is 217728, while the sum is 47.

The square root of 1978141439 is about 44476.3019933088. The cubic root of 1978141439 is about 1255.3142155934.

The spelling of 1978141439 in words is "one billion, nine hundred seventy-eight million, one hundred forty-one thousand, four hundred thirty-nine".