1230720139 has 4 divisors (see below), whose sum is σ = 1342603800. Its totient is φ = 1118836480.

The previous prime is 1230720131. The next prime is 1230720149. The reversal of 1230720139 is 9310270321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9310270321 = 11 ⋅846388211.

It is a cyclic number.

It is not a de Polignac number, because 1230720139 - 2³ = 1230720131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230720131) 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, 55941814 + ... + 55941835.

It is an arithmetic number, because the mean of its divisors is an integer number (335650950).

Almost surely, 2^1230720139 is an apocalyptic number.

1230720139 is a deficient number, since it is larger than the sum of its proper divisors (111883661).

1230720139 is a wasteful number, since it uses less digits than its factorization.

1230720139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111883660.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 1230720139 is about 35081.6210999435. The cubic root of 1230720139 is about 1071.6503309674.

The spelling of 1230720139 in words is "one billion, two hundred thirty million, seven hundred twenty thousand, one hundred thirty-nine".