2123199738 has 48 divisors (see below), whose sum is σ = 5042355552. Its totient is φ = 640332000.

The previous prime is 2123199731. The next prime is 2123199811. The reversal of 2123199738 is 8379913212.

2123199738 is a `hidden beast` number, since 212 + 319 + 97 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2123199693 and 2123199702.

It is not an unprimeable number, because it can be changed into a prime (2123199731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16368 + ... + 67188.

It is an arithmetic number, because the mean of its divisors is an integer number (105049074).

Almost surely, 2^2123199738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2123199738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2521177776).

2123199738 is an abundant number, since it is smaller than the sum of its proper divisors (2919155814).

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

2123199738 is a wasteful number, since it uses less digits than its factorization.

2123199738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51051 (or 51048 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 2123199738 is about 46078.1915660760. The cubic root of 2123199738 is about 1285.2776354584.

The spelling of 2123199738 in words is "two billion, one hundred twenty-three million, one hundred ninety-nine thousand, seven hundred thirty-eight".