1389401269 has 2 divisors, whose sum is σ = 1389401270. Its totient is φ = 1389401268.

The previous prime is 1389401257. The next prime is 1389401303. The reversal of 1389401269 is 9621049831.

It is a happy number.

1389401269 is nontrivially palindromic in base 7.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1367890225 + 21511044 = 36985^2 + 4638^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389401269 - 2⁷ = 1389401141 is a prime.

It is a super-4 number, since 4×1389401269⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389401219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694700634 + 694700635.

It is an arithmetic number, because the mean of its divisors is an integer number (694700635).

Almost surely, 2^1389401269 is an apocalyptic number.

It is an amenable number.

1389401269 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389401269 is an equidigital number, since it uses as much as digits as its factorization.

1389401269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1389401269 is about 37274.6732916601. The cubic root of 1389401269 is about 1115.8587682536.

The spelling of 1389401269 in words is "one billion, three hundred eighty-nine million, four hundred one thousand, two hundred sixty-nine".