1939769856 has 140 divisors (see below), whose sum is σ = 5812086522. Its totient is φ = 646465536.

The previous prime is 1939769827. The next prime is 1939769891. The reversal of 1939769856 is 6589679391.

It can be written as a sum of positive squares in only one way, i.e., 1684281600 + 255488256 = 41040^2 + 15984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1939769793 and 1939769802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 370650 + ... + 375846.

Almost surely, 2^1939769856 is an apocalyptic number.

1939769856 is a gapful number since it is divisible by the number (16) 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 1939769856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2906043261).

1939769856 is an abundant number, since it is smaller than the sum of its proper divisors (3872316666).

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

1939769856 is an frugal number, since it uses more digits than its factorization.

1939769856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233 (or 5202 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The square root of 1939769856 is about 44042.8184384242. The cubic root of 1939769856 is about 1247.1443839466.

It can be divided in two parts, 19397 and 69856, that added together give a triangular number (89253 = T₄₂₂).

The spelling of 1939769856 in words is "one billion, nine hundred thirty-nine million, seven hundred sixty-nine thousand, eight hundred fifty-six".