1978230771 has 96 divisors (see below), whose sum is σ = 3405991680. Its totient is φ = 1093478400.

The previous prime is 1978230763. The next prime is 1978230773. The reversal of 1978230771 is 1770328791.

It is not a de Polignac number, because 1978230771 - 2³ = 1978230763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978230773) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8714560 + ... + 8714786.

It is an arithmetic number, because the mean of its divisors is an integer number (35479080).

Almost surely, 2^1978230771 is an apocalyptic number.

1978230771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1978230771 is a deficient number, since it is larger than the sum of its proper divisors (1427760909).

1978230771 is a wasteful number, since it uses less digits than its factorization.

1978230771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 1978230771 is about 44477.3062471189. The cubic root of 1978230771 is about 1255.3331117888. Note that the first 3 decimals are identical.

The spelling of 1978230771 in words is "one billion, nine hundred seventy-eight million, two hundred thirty thousand, seven hundred seventy-one".