1977383808 has 192 divisors, whose sum is σ = 6091909200. Its totient is φ = 613785600.

The previous prime is 1977383791. The next prime is 1977383831. The reversal of 1977383808 is 8083837791.

1977383808 is a `hidden beast` number, since 197 + 73 + 8 + 380 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1334428 + ... + 1335908.

Almost surely, 2^1977383808 is an apocalyptic number.

1977383808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977383808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3045954600).

1977383808 is an abundant number, since it is smaller than the sum of its proper divisors (4114525392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1977383808 is a wasteful number, since it uses less digits than its factorization.

1977383808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The square root of 1977383808 is about 44467.7839339898. The cubic root of 1977383808 is about 1255.1539327489.

The spelling of 1977383808 in words is "one billion, nine hundred seventy-seven million, three hundred eighty-three thousand, eight hundred eight".