1389290381 has 2 divisors, whose sum is σ = 1389290382. Its totient is φ = 1389290380.

The previous prime is 1389290369. The next prime is 1389290407. The reversal of 1389290381 is 1830929831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1329769156 + 59521225 = 36466^2 + 7715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389290381 - 2¹⁸ = 1389028237 is a prime.

It is a super-2 number, since 2×1389290381² = 3860255525478250322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389290341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694645190 + 694645191.

It is an arithmetic number, because the mean of its divisors is an integer number (694645191).

Almost surely, 2^1389290381 is an apocalyptic number.

It is an amenable number.

1389290381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389290381 is an equidigital number, since it uses as much as digits as its factorization.

1389290381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1389290381 is about 37273.1858176894. The cubic root of 1389290381 is about 1115.8290819319.

The spelling of 1389290381 in words is "one billion, three hundred eighty-nine million, two hundred ninety thousand, three hundred eighty-one".