1229872917 has 16 divisors (see below), whose sum is σ = 2018253440. Its totient is φ = 648724032.

The previous prime is 1229872913. The next prime is 1229872957. The reversal of 1229872917 is 7192789221.

It is a happy number.

It is not a de Polignac number, because 1229872917 - 2² = 1229872913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229872913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2252242 + ... + 2252787.

It is an arithmetic number, because the mean of its divisors is an integer number (126140840).

Almost surely, 2^1229872917 is an apocalyptic number.

It is an amenable number.

1229872917 is a deficient number, since it is larger than the sum of its proper divisors (788380523).

1229872917 is a wasteful number, since it uses less digits than its factorization.

1229872917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505052.

The product of its digits is 254016, while the sum is 48.

The square root of 1229872917 is about 35069.5440090116. The cubic root of 1229872917 is about 1071.4043681568.

The spelling of 1229872917 in words is "one billion, two hundred twenty-nine million, eight hundred seventy-two thousand, nine hundred seventeen".