2730721393 has 2 divisors, whose sum is σ = 2730721394. Its totient is φ = 2730721392.

The previous prime is 2730721381. The next prime is 2730721451. The reversal of 2730721393 is 3931270372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2620723249 + 109998144 = 51193^2 + 10488^2 .

It is a cyclic number.

It is not a de Polignac number, because 2730721393 - 2¹⁷ = 2730590321 is a prime.

It is not a weakly prime, because it can be changed into another prime (2730721093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365360696 + 1365360697.

It is an arithmetic number, because the mean of its divisors is an integer number (1365360697).

Almost surely, 2^2730721393 is an apocalyptic number.

It is an amenable number.

2730721393 is a deficient number, since it is larger than the sum of its proper divisors (1).

2730721393 is an equidigital number, since it uses as much as digits as its factorization.

2730721393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 37.

The square root of 2730721393 is about 52256.3048157828. The cubic root of 2730721393 is about 1397.7380809875.

The spelling of 2730721393 in words is "two billion, seven hundred thirty million, seven hundred twenty-one thousand, three hundred ninety-three".