2378997891 has 8 divisors (see below), whose sum is σ = 3524441360. Its totient is φ = 1585998576.

The previous prime is 2378997883. The next prime is 2378997913. The reversal of 2378997891 is 1987998732.

It is not a de Polignac number, because 2378997891 - 2³ = 2378997883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2378997811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44055490 + ... + 44055543.

It is an arithmetic number, because the mean of its divisors is an integer number (440555170).

Almost surely, 2^2378997891 is an apocalyptic number.

2378997891 is a deficient number, since it is larger than the sum of its proper divisors (1145443469).

2378997891 is an equidigital number, since it uses as much as digits as its factorization.

2378997891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88111042 (or 88111036 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 2378997891 is about 48774.9719733389. The cubic root of 2378997891 is about 1334.9490347922.

The spelling of 2378997891 in words is "two billion, three hundred seventy-eight million, nine hundred ninety-seven thousand, eight hundred ninety-one".