2155390393 has 4 divisors (see below), whose sum is σ = 2321189668. Its totient is φ = 1989591120.

The previous prime is 2155390387. The next prime is 2155390423. The reversal of 2155390393 is 3930935512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147185424 + 2008204969 = 12132^2 + 44813^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155390393 - 2⁵ = 2155390361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155390313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82899618 + ... + 82899643.

It is an arithmetic number, because the mean of its divisors is an integer number (580297417).

Almost surely, 2^2155390393 is an apocalyptic number.

It is an amenable number.

2155390393 is a deficient number, since it is larger than the sum of its proper divisors (165799275).

2155390393 is a wasteful number, since it uses less digits than its factorization.

2155390393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165799274.

The product of its (nonzero) digits is 109350, while the sum is 40.

The square root of 2155390393 is about 46426.1821928101. The cubic root of 2155390393 is about 1291.7406130754.

The spelling of 2155390393 in words is "two billion, one hundred fifty-five million, three hundred ninety thousand, three hundred ninety-three".