1231378942 has 24 divisors (see below), whose sum is σ = 1952500032. Its totient is φ = 582357600.

The previous prime is 1231378933. The next prime is 1231378943. The reversal of 1231378942 is 2498731321.

It is a junction number, because it is equal to n+sod(n) for n = 1231378895 and 1231378904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231378943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 714642 + ... + 716362.

It is an arithmetic number, because the mean of its divisors is an integer number (81354168).

Almost surely, 2^1231378942 is an apocalyptic number.

1231378942 is a deficient number, since it is larger than the sum of its proper divisors (721121090).

1231378942 is a wasteful number, since it uses less digits than its factorization.

1231378942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752 (or 2733 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 1231378942 is about 35091.0094183681. The cubic root of 1231378942 is about 1071.8415145662.

The spelling of 1231378942 in words is "one billion, two hundred thirty-one million, three hundred seventy-eight thousand, nine hundred forty-two".