1231442340 has 24 divisors (see below), whose sum is σ = 3448038720. Its totient is φ = 328384608.

The previous prime is 1231442321. The next prime is 1231442363. The reversal of 1231442340 is 432441321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231442340.

It is an unprimeable number.

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, 10261960 + ... + 10262079.

It is an arithmetic number, because the mean of its divisors is an integer number (143668280).

Almost surely, 2^1231442340 is an apocalyptic number.

1231442340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231442340 is an abundant number, since it is smaller than the sum of its proper divisors (2216596380).

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

1231442340 is a wasteful number, since it uses less digits than its factorization.

1231442340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20524051 (or 20524049 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1231442340 is about 35091.9127435368. The cubic root of 1231442340 is about 1071.8599089694.

Adding to 1231442340 its reverse (432441321), we get a palindrome (1663883661).

The spelling of 1231442340 in words is "one billion, two hundred thirty-one million, four hundred forty-two thousand, three hundred forty".