1200156 has 24 divisors (see below), whose sum is σ = 2830464. Its totient is φ = 395760.

The previous prime is 1200139. The next prime is 1200161. The reversal of 1200156 is 6510021.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (117936).

2^1200156 is an apocalyptic number.

It is an amenable number.

1200156 is an abundant number, since it is smaller than the sum of its proper divisors (1630308).

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

1200156 is a wasteful number, since it uses less digits than its factorization.

1200156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1200156 is about 1095.5163166288. The cubic root of 1200156 is about 106.2704615725.

Adding to 1200156 its reverse (6510021), we get a palindrome (7710177).

It can be divided in two parts, 120015 and 6, that added together give a palindrome (120021).

The spelling of 1200156 in words is "one million, two hundred thousand, one hundred fifty-six".