2179400000 has 168 divisors, whose sum is σ = 5732492472. Its totient is φ = 819200000.

The previous prime is 2179399993. The next prime is 2179400039. The reversal of 2179400000 is 49712.

It can be written as a sum of positive squares in 12 ways, for example, as 1817487424 + 361912576 = 42632^2 + 19024^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3399680 + ... + 3400320.

It is an arithmetic number, because the mean of its divisors is an integer number (34121979).

Almost surely, 2^2179400000 is an apocalyptic number.

2179400000 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 2179400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2866246236).

2179400000 is an abundant number, since it is smaller than the sum of its proper divisors (3553092472).

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

2179400000 is an frugal number, since it uses more digits than its factorization.

2179400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 2179400000 is about 46684.0443834936. The cubic root of 2179400000 is about 1296.5192884207.

Adding to 2179400000 its reverse (49712), we get a palindrome (2179449712).

The spelling of 2179400000 in words is "two billion, one hundred seventy-nine million, four hundred thousand".