2138166720 has 336 divisors, whose sum is σ = 7881689088. Its totient is φ = 551162880.

The previous prime is 2138166703. The next prime is 2138166727. The reversal of 2138166720 is 276618312.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138166727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2410117 + ... + 2411003.

It is an arithmetic number, because the mean of its divisors is an integer number (23457408).

Almost surely, 2^2138166720 is an apocalyptic number.

2138166720 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 2138166720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3940844544).

2138166720 is an abundant number, since it is smaller than the sum of its proper divisors (5743522368).

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

2138166720 is an equidigital number, since it uses as much as digits as its factorization.

2138166720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 2138166720 is about 46240.3148778206. The cubic root of 2138166720 is about 1288.2906510713.

The spelling of 2138166720 in words is "two billion, one hundred thirty-eight million, one hundred sixty-six thousand, seven hundred twenty".