1389227849 has 2 divisors, whose sum is σ = 1389227850. Its totient is φ = 1389227848.

The previous prime is 1389227843. The next prime is 1389227929. The reversal of 1389227849 is 9487229831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1323504400 + 65723449 = 36380^2 + 8107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389227849 - 2¹² = 1389223753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1389227849.

It is not a weakly prime, because it can be changed into another prime (1389227843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694613924 + 694613925.

It is an arithmetic number, because the mean of its divisors is an integer number (694613925).

Almost surely, 2^1389227849 is an apocalyptic number.

It is an amenable number.

1389227849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389227849 is an equidigital number, since it uses as much as digits as its factorization.

1389227849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 1389227849 is about 37272.3469746674. The cubic root of 1389227849 is about 1115.8123405144.

The spelling of 1389227849 in words is "one billion, three hundred eighty-nine million, two hundred twenty-seven thousand, eight hundred forty-nine".