1390089209 has 2 divisors, whose sum is σ = 1390089210. Its totient is φ = 1390089208.

The previous prime is 1390089199. The next prime is 1390089319. The reversal of 1390089209 is 9029800931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 761484025 + 628605184 = 27595^2 + 25072^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390089209 - 2¹⁶ = 1390023673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1390089409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695044604 + 695044605.

It is an arithmetic number, because the mean of its divisors is an integer number (695044605).

Almost surely, 2^1390089209 is an apocalyptic number.

It is an amenable number.

1390089209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390089209 is an equidigital number, since it uses as much as digits as its factorization.

1390089209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1390089209 is about 37283.9001312899. The cubic root of 1390089209 is about 1116.0429044561.

The spelling of 1390089209 in words is "one billion, three hundred ninety million, eighty-nine thousand, two hundred nine".