1389491 has 2 divisors, whose sum is σ = 1389492. Its totient is φ = 1389490.

The previous prime is 1389481. The next prime is 1389511. The reversal of 1389491 is 1949831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389491 - 2¹⁰ = 1388467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1389431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694745 + 694746.

It is an arithmetic number, because the mean of its divisors is an integer number (694746).

2^1389491 is an apocalyptic number.

1389491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389491 is an equidigital number, since it uses as much as digits as its factorization.

1389491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 1389491 is about 1178.7667284073. The cubic root of 1389491 is about 111.5882789384.

The spelling of 1389491 in words is "one million, three hundred eighty-nine thousand, four hundred ninety-one".