2139944940 has 192 divisors, whose sum is σ = 7630801920. Its totient is φ = 487710720.

The previous prime is 2139944903. The next prime is 2139945019. The reversal of 2139944940 is 494499312.

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 63 ways as a sum of consecutive naturals, for example, 1855404 + ... + 1856556.

It is an arithmetic number, because the mean of its divisors is an integer number (39743760).

Almost surely, 2^2139944940 is an apocalyptic number.

2139944940 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 2139944940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3815400960).

2139944940 is an abundant number, since it is smaller than the sum of its proper divisors (5490856980).

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

2139944940 is a wasteful number, since it uses less digits than its factorization.

2139944940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669 (or 1661 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 2139944940 is about 46259.5389082079. The cubic root of 2139944940 is about 1288.6476904924.

The spelling of 2139944940 in words is "two billion, one hundred thirty-nine million, nine hundred forty-four thousand, nine hundred forty".