2149694820 has 288 divisors, whose sum is σ = 8244757248. Its totient is φ = 441179136.

The previous prime is 2149694819. The next prime is 2149694831. The reversal of 2149694820 is 284969412.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 604287 + ... + 607833.

Almost surely, 2^2149694820 is an apocalyptic number.

2149694820 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 2149694820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4122378624).

2149694820 is an abundant number, since it is smaller than the sum of its proper divisors (6095062428).

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

2149694820 is a wasteful number, since it uses less digits than its factorization.

2149694820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3619 (or 3614 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 2149694820 is about 46364.8015201187. The cubic root of 2149694820 is about 1290.6018104204.

The spelling of 2149694820 in words is "two billion, one hundred forty-nine million, six hundred ninety-four thousand, eight hundred twenty".