1213278042 has 8 divisors (see below), whose sum is σ = 2426556096. Its totient is φ = 404426012.

The previous prime is 1213278023. The next prime is 1213278043. The reversal of 1213278042 is 2408723121.

It is a sphenic number, since it is the product of 3 distinct primes.

1213278042 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1213278043) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 101106498 + ... + 101106509.

It is an arithmetic number, because the mean of its divisors is an integer number (303319512).

Almost surely, 2^1213278042 is an apocalyptic number.

1213278042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1213278042 is a wasteful number, since it uses less digits than its factorization.

1213278042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202213012.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 1213278042 is about 34832.1409333391. The cubic root of 1213278042 is about 1066.5636525300.

The spelling of 1213278042 in words is "one billion, two hundred thirteen million, two hundred seventy-eight thousand, forty-two".