1239086945 has 8 divisors (see below), whose sum is σ = 1509097344. Its totient is φ = 976474224.

The previous prime is 1239086941. The next prime is 1239086987. The reversal of 1239086945 is 5496809321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1239086945 - 2² = 1239086941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1239086945.

It is not an unprimeable number, because it can be changed into a prime (1239086941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1849049 + ... + 1849718.

It is an arithmetic number, because the mean of its divisors is an integer number (188637168).

Almost surely, 2^1239086945 is an apocalyptic number.

It is an amenable number.

1239086945 is a deficient number, since it is larger than the sum of its proper divisors (270010399).

1239086945 is an equidigital number, since it uses as much as digits as its factorization.

1239086945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3698839.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 1239086945 is about 35200.6668260702. Note that the first 3 decimals coincide. The cubic root of 1239086945 is about 1074.0733156941.

The spelling of 1239086945 in words is "one billion, two hundred thirty-nine million, eighty-six thousand, nine hundred forty-five".