1200155 has 8 divisors (see below), whose sum is σ = 1571184. Its totient is φ = 872800.

The previous prime is 1200139. The next prime is 1200161. The reversal of 1200155 is 5510021.

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

It is not a de Polignac number, because 1200155 - 2⁴ = 1200139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10856 + ... + 10965.

It is an arithmetic number, because the mean of its divisors is an integer number (196398).

2^1200155 is an apocalyptic number.

1200155 is a deficient number, since it is larger than the sum of its proper divisors (371029).

1200155 is a wasteful number, since it uses less digits than its factorization.

1200155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21837.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 1200155 is about 1095.5158602229. The cubic root of 1200155 is about 106.2704320568.

Adding to 1200155 its reverse (5510021), we get a palindrome (6710176).

The spelling of 1200155 in words is "one million, two hundred thousand, one hundred fifty-five".