1978738383 has 4 divisors (see below), whose sum is σ = 2638317848. Its totient is φ = 1319158920.

The previous prime is 1978738381. The next prime is 1978738393. The reversal of 1978738383 is 3838378791.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1978738383 - 2¹ = 1978738381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978738381) 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 3 ways as a sum of consecutive naturals, for example, 329789728 + ... + 329789733.

It is an arithmetic number, because the mean of its divisors is an integer number (659579462).

Almost surely, 2^1978738383 is an apocalyptic number.

1978738383 is a deficient number, since it is larger than the sum of its proper divisors (659579465).

1978738383 is an equidigital number, since it uses as much as digits as its factorization.

1978738383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659579464.

The product of its digits is 6096384, while the sum is 57.

The square root of 1978738383 is about 44483.0122968308. The cubic root of 1978738383 is about 1255.4404750053.

The spelling of 1978738383 in words is "one billion, nine hundred seventy-eight million, seven hundred thirty-eight thousand, three hundred eighty-three".