1230440789 has 2 divisors, whose sum is σ = 1230440790. Its totient is φ = 1230440788.

The previous prime is 1230440767. The next prime is 1230440819. The reversal of 1230440789 is 9870440321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1195983889 + 34456900 = 34583^2 + 5870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230440789 - 2²⁴ = 1213663573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1230440719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615220394 + 615220395.

It is an arithmetic number, because the mean of its divisors is an integer number (615220395).

Almost surely, 2^1230440789 is an apocalyptic number.

It is an amenable number.

1230440789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230440789 is an equidigital number, since it uses as much as digits as its factorization.

1230440789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1230440789 is about 35077.6394445236. The cubic root of 1230440789 is about 1071.5692434363.

The spelling of 1230440789 in words is "one billion, two hundred thirty million, four hundred forty thousand, seven hundred eighty-nine".