1220855835 has 16 divisors (see below), whose sum is σ = 1953900576. Its totient is φ = 650946048.

The previous prime is 1220855827. The next prime is 1220855897. The reversal of 1220855835 is 5385580221.

It is not a de Polignac number, because 1220855835 - 2³ = 1220855827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220855793 and 1220855802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61117 + ... + 78593.

It is an arithmetic number, because the mean of its divisors is an integer number (122118786).

Almost surely, 2^1220855835 is an apocalyptic number.

1220855835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220855835 is a deficient number, since it is larger than the sum of its proper divisors (733044741).

1220855835 is a wasteful number, since it uses less digits than its factorization.

1220855835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22142.

The product of its (nonzero) digits is 96000, while the sum is 39.

The square root of 1220855835 is about 34940.7474877112. The cubic root of 1220855835 is about 1068.7795310742.

The spelling of 1220855835 in words is "one billion, two hundred twenty million, eight hundred fifty-five thousand, eight hundred thirty-five".