1977857000 has 128 divisors (see below), whose sum is σ = 5380128000. Its totient is φ = 666489600.

The previous prime is 1977856999. The next prime is 1977857029. The reversal of 1977857000 is 7587791.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 410606 + ... + 415394.

It is an arithmetic number, because the mean of its divisors is an integer number (42032250).

Almost surely, 2^1977857000 is an apocalyptic number.

1977857000 is a gapful number since it is divisible by the number (10) 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 1977857000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2690064000).

1977857000 is an abundant number, since it is smaller than the sum of its proper divisors (3402271000).

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

1977857000 is a wasteful number, since it uses less digits than its factorization.

1977857000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4876 (or 4862 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 44.

The square root of 1977857000 is about 44473.1042316589. The cubic root of 1977857000 is about 1255.2540450669.

The spelling of 1977857000 in words is "one billion, nine hundred seventy-seven million, eight hundred fifty-seven thousand".