1390069 has 2 divisors, whose sum is σ = 1390070. Its totient is φ = 1390068.

The previous prime is 1390043. The next prime is 1390087. The reversal of 1390069 is 9600931.

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., 1129969 + 260100 = 1063^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390069 - 2¹¹ = 1388021 is a prime.

It is a super-2 number, since 2×1390069² = 3864583649522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695034 + 695035.

It is an arithmetic number, because the mean of its divisors is an integer number (695035).

2^1390069 is an apocalyptic number.

It is an amenable number.

1390069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390069 is an equidigital number, since it uses as much as digits as its factorization.

1390069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 1390069 is about 1179.0118744101. The cubic root of 1390069 is about 111.6037496117.

Subtracting from 1390069 its sum of digits (28), we obtain a square (1390041 = 1179²).

Subtracting from 1390069 its product of nonzero digits (1458), we obtain a triangular number (1388611 = T₁₆₆₆).

The spelling of 1390069 in words is "one million, three hundred ninety thousand, sixty-nine".