1231858878 has 16 divisors (see below), whose sum is σ = 2485521936. Its totient is φ = 406985600.

The previous prime is 1231858877. The next prime is 1231858907. The reversal of 1231858878 is 8788581321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231858878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231858877) 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 7 ways as a sum of consecutive naturals, for example, 907773 + ... + 909128.

It is an arithmetic number, because the mean of its divisors is an integer number (155345121).

Almost surely, 2^1231858878 is an apocalyptic number.

1231858878 is an abundant number, since it is smaller than the sum of its proper divisors (1253663058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231858878 is a wasteful number, since it uses less digits than its factorization.

1231858878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817019.

The product of its digits is 860160, while the sum is 51.

The square root of 1231858878 is about 35097.8471989380. The cubic root of 1231858878 is about 1071.9807483130.

The spelling of 1231858878 in words is "one billion, two hundred thirty-one million, eight hundred fifty-eight thousand, eight hundred seventy-eight".