2138395730 has 8 divisors (see below), whose sum is σ = 3849112332. Its totient is φ = 855358288.

The previous prime is 2138395729. The next prime is 2138395741. The reversal of 2138395730 is 375938312.

It can be written as a sum of positive squares in 2 ways, for example, as 2138230081 + 165649 = 46241^2 + 407^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106919777 + ... + 106919796.

Almost surely, 2^2138395730 is an apocalyptic number.

2138395730 is a deficient number, since it is larger than the sum of its proper divisors (1710716602).

2138395730 is a wasteful number, since it uses less digits than its factorization.

2138395730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213839580.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 2138395730 is about 46242.7911138590. The cubic root of 2138395730 is about 1288.3366438847.

The spelling of 2138395730 in words is "two billion, one hundred thirty-eight million, three hundred ninety-five thousand, seven hundred thirty".