1228109873 has 4 divisors (see below), whose sum is σ = 1235208948. Its totient is φ = 1221010800.

The previous prime is 1228109849. The next prime is 1228109881. The reversal of 1228109873 is 3789018221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3789018221 = 4073 ⋅930277.

It can be written as a sum of positive squares in 2 ways, for example, as 906732544 + 321377329 = 30112^2 + 17927^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228109873 - 2¹² = 1228105777 is a prime.

It is a super-2 number, since 2×1228109873² = 3016507720320152258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228109873.

It is not an unprimeable number, because it can be changed into a prime (1228109833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3549278 + ... + 3549623.

It is an arithmetic number, because the mean of its divisors is an integer number (308802237).

Almost surely, 2^1228109873 is an apocalyptic number.

It is an amenable number.

1228109873 is a deficient number, since it is larger than the sum of its proper divisors (7099075).

1228109873 is an equidigital number, since it uses as much as digits as its factorization.

1228109873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7099074.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 1228109873 is about 35044.3985966374. The cubic root of 1228109873 is about 1070.8921644588.

The spelling of 1228109873 in words is "one billion, two hundred twenty-eight million, one hundred nine thousand, eight hundred seventy-three".