2139943730 has 8 divisors (see below), whose sum is σ = 3851898732. Its totient is φ = 855977488.

The previous prime is 2139943721. The next prime is 2139943739. The reversal of 2139943730 is 373499312.

It is an interprime number because it is at equal distance from previous prime (2139943721) and next prime (2139943739).

It can be written as a sum of positive squares in 2 ways, for example, as 2072161441 + 67782289 = 45521^2 + 8233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2139943739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106997177 + ... + 106997196.

Almost surely, 2^2139943730 is an apocalyptic number.

2139943730 is a deficient number, since it is larger than the sum of its proper divisors (1711955002).

2139943730 is a wasteful number, since it uses less digits than its factorization.

2139943730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213994380.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 2139943730 is about 46259.5258298223. The cubic root of 2139943730 is about 1288.6474476102.

The spelling of 2139943730 in words is "two billion, one hundred thirty-nine million, nine hundred forty-three thousand, seven hundred thirty".