1977709900 has 18 divisors (see below), whose sum is σ = 4291630700. Its totient is φ = 791083920.

The previous prime is 1977709871. The next prime is 1977709927. The reversal of 1977709900 is 99077791.

It is a happy number.

It is a super-2 number, since 2×1977709900² = 7822672897116020000, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 9888450 + ... + 9888649.

Almost surely, 2^1977709900 is an apocalyptic number.

1977709900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1977709900 is an abundant number, since it is smaller than the sum of its proper divisors (2313920800).

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

1977709900 is a wasteful number, since it uses less digits than its factorization.

1977709900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19777113 (or 19777106 counting only the distinct ones).

The product of its (nonzero) digits is 250047, while the sum is 49.

The square root of 1977709900 is about 44471.4503923585. The cubic root of 1977709900 is about 1255.2229251144. Note that the first 3 decimals are identical.

The spelling of 1977709900 in words is "one billion, nine hundred seventy-seven million, seven hundred nine thousand, nine hundred".