1977856982 has 8 divisors (see below), whose sum is σ = 3035780616. Its totient is φ = 965930112.

The previous prime is 1977856957. The next prime is 1977856987. The reversal of 1977856982 is 2896587791.

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

It is a super-2 number, since 2×1977856982² = 7823836482492296648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977856987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11499083 + ... + 11499254.

It is an arithmetic number, because the mean of its divisors is an integer number (379472577).

Almost surely, 2^1977856982 is an apocalyptic number.

1977856982 is a deficient number, since it is larger than the sum of its proper divisors (1057923634).

1977856982 is a wasteful number, since it uses less digits than its factorization.

1977856982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22998382.

The product of its digits is 15240960, while the sum is 62.

The square root of 1977856982 is about 44473.1040292894. The cubic root of 1977856982 is about 1255.2540412590.

The spelling of 1977856982 in words is "one billion, nine hundred seventy-seven million, eight hundred fifty-six thousand, nine hundred eighty-two".