1389749 has 2 divisors, whose sum is σ = 1389750. Its totient is φ = 1389748.

The previous prime is 1389727. The next prime is 1389769. The reversal of 1389749 is 9479831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 515524 = 935^2 + 718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389749 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 1 + 3⁵ + 8⁵ + 9³ + 7⁷ + 4⁵ + 9⁶ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694874 + 694875.

It is an arithmetic number, because the mean of its divisors is an integer number (694875).

2^1389749 is an apocalyptic number.

It is an amenable number.

1389749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389749 is an equidigital number, since it uses as much as digits as its factorization.

1389749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 1389749 is about 1178.8761597386. The cubic root of 1389749 is about 111.5951850631.

The spelling of 1389749 in words is "one million, three hundred eighty-nine thousand, seven hundred forty-nine".