1390469 has 2 divisors, whose sum is σ = 1390470. Its totient is φ = 1390468.

The previous prime is 1390457. The next prime is 1390471. The reversal of 1390469 is 9640931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 113569 = 1130^2 + 337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1390469 is a prime.

It is a super-2 number, since 2×1390469² = 3866808079922, which contains 22 as substring.

Together with 1390471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390409) 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, 695234 + 695235.

It is an arithmetic number, because the mean of its divisors is an integer number (695235).

2^1390469 is an apocalyptic number.

It is an amenable number.

1390469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390469 is an equidigital number, since it uses as much as digits as its factorization.

1390469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1390469 is about 1179.1814957843. The cubic root of 1390469 is about 111.6144534494.

The spelling of 1390469 in words is "one million, three hundred ninety thousand, four hundred sixty-nine".