2155786399 has 8 divisors (see below), whose sum is σ = 2325487472. Its totient is φ = 1986638400.

The previous prime is 2155786397. The next prime is 2155786403. The reversal of 2155786399 is 9936875512.

2155786399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2155786399 - 2¹ = 2155786397 is a prime.

It is a super-2 number, since 2×2155786399² = 9294829996226774402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155786393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130149 + ... + 145774.

It is an arithmetic number, because the mean of its divisors is an integer number (290685934).

Almost surely, 2^2155786399 is an apocalyptic number.

2155786399 is a deficient number, since it is larger than the sum of its proper divisors (169701073).

2155786399 is a wasteful number, since it uses less digits than its factorization.

2155786399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276537.

The product of its digits is 4082400, while the sum is 55.

The square root of 2155786399 is about 46430.4468964062. The cubic root of 2155786399 is about 1291.8197179575.

The spelling of 2155786399 in words is "two billion, one hundred fifty-five million, seven hundred eighty-six thousand, three hundred ninety-nine".