2111869780 has 12 divisors (see below), whose sum is σ = 4434926580. Its totient is φ = 844747904.

The previous prime is 2111869759. The next prime is 2111869783. The reversal of 2111869780 is 879681112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1362643396 + 749226384 = 36914^2 + 27372^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111869783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52796725 + ... + 52796764.

It is an arithmetic number, because the mean of its divisors is an integer number (369577215).

Almost surely, 2^2111869780 is an apocalyptic number.

2111869780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111869780 is an abundant number, since it is smaller than the sum of its proper divisors (2323056800).

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

2111869780 is a wasteful number, since it uses less digits than its factorization.

2111869780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105593498 (or 105593496 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 2111869780 is about 45955.0843759426. The cubic root of 2111869780 is about 1282.9873624462.

The spelling of 2111869780 in words is "two billion, one hundred eleven million, eight hundred sixty-nine thousand, seven hundred eighty".