1205156142 has 24 divisors (see below), whose sum is σ = 2611937016. Its totient is φ = 401600976.

The previous prime is 1205156131. The next prime is 1205156143. The reversal of 1205156142 is 2416515021.

1205156142 is a `hidden beast` number, since 1 + 2 + 0 + 515 + 6 + 142 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205156143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71533 + ... + 86759.

It is an arithmetic number, because the mean of its divisors is an integer number (108830709).

Almost surely, 2^1205156142 is an apocalyptic number.

1205156142 is an abundant number, since it is smaller than the sum of its proper divisors (1406780874).

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

1205156142 is a wasteful number, since it uses less digits than its factorization.

1205156142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19632 (or 19629 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1205156142 is about 34715.3588775919. The cubic root of 1205156142 is about 1064.1783995952.

The spelling of 1205156142 in words is "one billion, two hundred five million, one hundred fifty-six thousand, one hundred forty-two".