2155409385 has 16 divisors (see below), whose sum is σ = 3559902720. Its totient is φ = 1112469120.

The previous prime is 2155409383. The next prime is 2155409393. The reversal of 2155409385 is 5839045512.

It is not a de Polignac number, because 2155409385 - 2¹ = 2155409383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2155409383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2317180 + ... + 2318109.

It is an arithmetic number, because the mean of its divisors is an integer number (222493920).

Almost surely, 2^2155409385 is an apocalyptic number.

It is an amenable number.

2155409385 is a deficient number, since it is larger than the sum of its proper divisors (1404493335).

2155409385 is a wasteful number, since it uses less digits than its factorization.

2155409385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635328.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 2155409385 is about 46426.3867321160. The cubic root of 2155409385 is about 1291.7444070773.

The spelling of 2155409385 in words is "two billion, one hundred fifty-five million, four hundred nine thousand, three hundred eighty-five".