2149493780 has 54 divisors (see below), whose sum is σ = 5254454142. Its totient is φ = 736471680.

The previous prime is 2149493777. The next prime is 2149493803. The reversal of 2149493780 is 873949412.

It can be written as a sum of positive squares in 3 ways, for example, as 131148304 + 2018345476 = 11452^2 + 44926^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1450640 + ... + 1452120.

Almost surely, 2^2149493780 is an apocalyptic number.

2149493780 is a gapful number since it is divisible by the number (20) 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 2149493780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2627227071).

2149493780 is an abundant number, since it is smaller than the sum of its proper divisors (3104960362).

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

2149493780 is an equidigital number, since it uses as much as digits as its factorization.

2149493780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985 (or 1495 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 2149493780 is about 46362.6334454806. The cubic root of 2149493780 is about 1290.5615766976.

The spelling of 2149493780 in words is "two billion, one hundred forty-nine million, four hundred ninety-three thousand, seven hundred eighty".