1138790321 has 4 divisors (see below), whose sum is σ = 1141261044. Its totient is φ = 1136319600.

The previous prime is 1138790287. The next prime is 1138790347. The reversal of 1138790321 is 1230978311.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 428034721 + 710755600 = 20689^2 + 26660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138790321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138790381) 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, 1234670 + ... + 1235591.

It is an arithmetic number, because the mean of its divisors is an integer number (285315261).

Almost surely, 2^1138790321 is an apocalyptic number.

It is an amenable number.

1138790321 is a deficient number, since it is larger than the sum of its proper divisors (2470723).

1138790321 is an equidigital number, since it uses as much as digits as its factorization.

1138790321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470722.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1138790321 is about 33745.9674776113. The cubic root of 1138790321 is about 1044.2742978578.

The spelling of 1138790321 in words is "one billion, one hundred thirty-eight million, seven hundred ninety thousand, three hundred twenty-one".