2378861861 has 4 divisors (see below), whose sum is σ = 2436882924. Its totient is φ = 2320840800.

The previous prime is 2378861843. The next prime is 2378861869. The reversal of 2378861861 is 1681688732.

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 179720836 + 2199141025 = 13406^2 + 46895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2378861861 - 2¹⁰ = 2378860837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2378861869) 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, 29010470 + ... + 29010551.

It is an arithmetic number, because the mean of its divisors is an integer number (609220731).

Almost surely, 2^2378861861 is an apocalyptic number.

It is an amenable number.

2378861861 is a deficient number, since it is larger than the sum of its proper divisors (58021063).

2378861861 is an equidigital number, since it uses as much as digits as its factorization.

2378861861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58021062.

The product of its digits is 774144, while the sum is 50.

The square root of 2378861861 is about 48773.5774882261. The cubic root of 2378861861 is about 1334.9235903842.

The spelling of 2378861861 in words is "two billion, three hundred seventy-eight million, eight hundred sixty-one thousand, eight hundred sixty-one".