2378129691 has 48 divisors (see below), whose sum is σ = 3864837120. Its totient is φ = 1295300160.

The previous prime is 2378129603. The next prime is 2378129729. The reversal of 2378129691 is 1969218732.

It is not a de Polignac number, because 2378129691 - 2⁷ = 2378129563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2378129691.

It is not an unprimeable number, because it can be changed into a prime (2378129791) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 301425 + ... + 309213.

It is an arithmetic number, because the mean of its divisors is an integer number (80517440).

Almost surely, 2^2378129691 is an apocalyptic number.

2378129691 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2378129691 is a deficient number, since it is larger than the sum of its proper divisors (1486707429).

2378129691 is a wasteful number, since it uses less digits than its factorization.

2378129691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7904 (or 7897 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 2378129691 is about 48766.0711048163. The cubic root of 2378129691 is about 1334.7866213413.

The spelling of 2378129691 in words is "two billion, three hundred seventy-eight million, one hundred twenty-nine thousand, six hundred ninety-one".