1220002005 has 16 divisors (see below), whose sum is σ = 1967376384. Its totient is φ = 645543360.

The previous prime is 1220001973. The next prime is 1220002019. The reversal of 1220002005 is 5002000221.

It is not a de Polignac number, because 1220002005 - 2⁵ = 1220001973 is a prime.

It is a congruent number.

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, 318306 + ... + 322115.

It is an arithmetic number, because the mean of its divisors is an integer number (122961024).

Almost surely, 2^1220002005 is an apocalyptic number.

1220002005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220002005 is a deficient number, since it is larger than the sum of its proper divisors (747374379).

1220002005 is a wasteful number, since it uses less digits than its factorization.

1220002005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640556.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 1220002005 is about 34928.5270946257. The cubic root of 1220002005 is about 1068.5303155043.

Adding to 1220002005 its reverse (5002000221), we get a palindrome (6222002226).

The spelling of 1220002005 in words is "one billion, two hundred twenty million, two thousand, five".