1220129295 has 64 divisors (see below), whose sum is σ = 2470404096. Its totient is φ = 499466880.

The previous prime is 1220129293. The next prime is 1220129303. The reversal of 1220129295 is 5929210221.

It is not a de Polignac number, because 1220129295 - 2¹ = 1220129293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220129293) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69502 + ... + 85268.

It is an arithmetic number, because the mean of its divisors is an integer number (38600064).

Almost surely, 2^1220129295 is an apocalyptic number.

1220129295 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220129295 is an abundant number, since it is smaller than the sum of its proper divisors (1250274801).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220129295 is a wasteful number, since it uses less digits than its factorization.

1220129295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15860.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1220129295 is about 34930.3491966513. The cubic root of 1220129295 is about 1068.5674762339.

The spelling of 1220129295 in words is "one billion, two hundred twenty million, one hundred twenty-nine thousand, two hundred ninety-five".