1238209145 has 4 divisors (see below), whose sum is σ = 1485850980. Its totient is φ = 990567312.

The previous prime is 1238209109. The next prime is 1238209199. The reversal of 1238209145 is 5419028321.

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 722964544 + 515244601 = 26888^2 + 22699^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238209145 - 2²² = 1234014841 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123820910 + ... + 123820919.

It is an arithmetic number, because the mean of its divisors is an integer number (371462745).

Almost surely, 2^1238209145 is an apocalyptic number.

It is an amenable number.

1238209145 is a deficient number, since it is larger than the sum of its proper divisors (247641835).

1238209145 is an equidigital number, since it uses as much as digits as its factorization.

1238209145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247641834.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1238209145 is about 35188.1961032389. The cubic root of 1238209145 is about 1073.8196223631.

The spelling of 1238209145 in words is "one billion, two hundred thirty-eight million, two hundred nine thousand, one hundred forty-five".