1220401005 has 16 divisors (see below), whose sum is σ = 1953103104. Its totient is φ = 650726720.

The previous prime is 1220401003. The next prime is 1220401031. The reversal of 1220401005 is 5001040221.

It is not a de Polignac number, because 1220401005 - 2¹ = 1220401003 is a prime.

It is a super-2 number, since 2×1220401005² = 2978757226010020050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220401003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87835 + ... + 100775.

It is an arithmetic number, because the mean of its divisors is an integer number (122068944).

Almost surely, 2^1220401005 is an apocalyptic number.

1220401005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220401005 is a deficient number, since it is larger than the sum of its proper divisors (732702099).

1220401005 is a wasteful number, since it uses less digits than its factorization.

1220401005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19236.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1220401005 is about 34934.2382913954. The cubic root of 1220401005 is about 1068.6467899375.

Adding to 1220401005 its reverse (5001040221), we get a palindrome (6221441226).

The spelling of 1220401005 in words is "one billion, two hundred twenty million, four hundred one thousand, five".