1390489 has 2 divisors, whose sum is σ = 1390490. Its totient is φ = 1390488.

The previous prime is 1390483. The next prime is 1390507. The reversal of 1390489 is 9840931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1192464 + 198025 = 1092^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390489 - 2⁵ = 1390457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1390483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695244 + 695245.

It is an arithmetic number, because the mean of its divisors is an integer number (695245).

2^1390489 is an apocalyptic number.

It is an amenable number.

1390489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390489 is an equidigital number, since it uses as much as digits as its factorization.

1390489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1390489 is about 1179.1899762125. The cubic root of 1390489 is about 111.6149885873.

The spelling of 1390489 in words is "one million, three hundred ninety thousand, four hundred eighty-nine".