1939666680 has 384 divisors, whose sum is σ = 8033126400. Its totient is φ = 395145216.

The previous prime is 1939666657. The next prime is 1939666681. The reversal of 1939666680 is 866669391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1939666681) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 812769 + ... + 815151.

It is an arithmetic number, because the mean of its divisors is an integer number (20919600).

Almost surely, 2^1939666680 is an apocalyptic number.

1939666680 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 1939666680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4016563200).

1939666680 is an abundant number, since it is smaller than the sum of its proper divisors (6093459720).

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

1939666680 is a wasteful number, since it uses less digits than its factorization.

1939666680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443 (or 2436 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 1939666680 is about 44041.6471081634. The cubic root of 1939666680 is about 1247.1222717615.

The spelling of 1939666680 in words is "one billion, nine hundred thirty-nine million, six hundred sixty-six thousand, six hundred eighty".