1231378892 has 48 divisors (see below), whose sum is σ = 2241564192. Its totient is φ = 591552000.

The previous prime is 1231378891. The next prime is 1231378921. The reversal of 1231378892 is 2988731321.

It is not an unprimeable number, because it can be changed into a prime (1231378891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3884318 + ... + 3884634.

It is an arithmetic number, because the mean of its divisors is an integer number (46699254).

Almost surely, 2^1231378892 is an apocalyptic number.

It is an amenable number.

1231378892 is a deficient number, since it is larger than the sum of its proper divisors (1010185300).

1231378892 is a wasteful number, since it uses less digits than its factorization.

1231378892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 696 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 1231378892 is about 35091.0087059349. The cubic root of 1231378892 is about 1071.8415000588.

The spelling of 1231378892 in words is "one billion, two hundred thirty-one million, three hundred seventy-eight thousand, eight hundred ninety-two".