1213527042 has 96 divisors (see below), whose sum is σ = 3378412800. Its totient is φ = 320042016.

The previous prime is 1213526983. The next prime is 1213527067. The reversal of 1213527042 is 2407253121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1213526997 and 1213527015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16759 + ... + 52037.

It is an arithmetic number, because the mean of its divisors is an integer number (35191800).

Almost surely, 2^1213527042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213527042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1689206400).

1213527042 is an abundant number, since it is smaller than the sum of its proper divisors (2164885758).

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

1213527042 is a wasteful number, since it uses less digits than its factorization.

1213527042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35317 (or 35304 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1213527042 is about 34835.7150350039. The cubic root of 1213527042 is about 1066.6366108502.

The spelling of 1213527042 in words is "one billion, two hundred thirteen million, five hundred twenty-seven thousand, forty-two".