1138428217 has 4 divisors (see below), whose sum is σ = 1187925120. Its totient is φ = 1088931316.

The previous prime is 1138428199. The next prime is 1138428223. The reversal of 1138428217 is 7128248311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1138428217 - 2¹¹ = 1138426169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138428227) 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, 24748417 + ... + 24748462.

It is an arithmetic number, because the mean of its divisors is an integer number (296981280).

Almost surely, 2^1138428217 is an apocalyptic number.

It is an amenable number.

1138428217 is a deficient number, since it is larger than the sum of its proper divisors (49496903).

1138428217 is an equidigital number, since it uses as much as digits as its factorization.

1138428217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49496902.

The product of its digits is 21504, while the sum is 37.

The square root of 1138428217 is about 33740.6019063087. The cubic root of 1138428217 is about 1044.1636026229.

It can be divided in two parts, 11384 and 28217, that added together give a square (39601 = 199²).

The spelling of 1138428217 in words is "one billion, one hundred thirty-eight million, four hundred twenty-eight thousand, two hundred seventeen".