1200022155 has 32 divisors (see below), whose sum is σ = 2157364800. Its totient is φ = 632814336.

The previous prime is 1200022099. The next prime is 1200022177. The reversal of 1200022155 is 5512200021.

It is not a de Polignac number, because 1200022155 - 2⁶ = 1200022091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37924 + ... + 61953.

It is an arithmetic number, because the mean of its divisors is an integer number (67417650).

Almost surely, 2^1200022155 is an apocalyptic number.

1200022155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1200022155 is a deficient number, since it is larger than the sum of its proper divisors (957342645).

1200022155 is an equidigital number, since it uses as much as digits as its factorization.

1200022155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99980 (or 99974 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1200022155 is about 34641.3359297819. The cubic root of 1200022155 is about 1062.6651089203.

Adding to 1200022155 its reverse (5512200021), we get a palindrome (6712222176).

The spelling of 1200022155 in words is "one billion, two hundred million, twenty-two thousand, one hundred fifty-five".