1390043 has 2 divisors, whose sum is σ = 1390044. Its totient is φ = 1390042.

The previous prime is 1390027. The next prime is 1390069. The reversal of 1390043 is 3400931.

It is a weak prime.

It is an emirp because it is prime and its reverse (3400931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1390043 - 2⁴ = 1390027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1389997 and 1390024.

It is not a weakly prime, because it can be changed into another prime (1390003) 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, 695021 + 695022.

It is an arithmetic number, because the mean of its divisors is an integer number (695022).

2^1390043 is an apocalyptic number.

1390043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390043 is an equidigital number, since it uses as much as digits as its factorization.

1390043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 1390043 is about 1179.0008481761. Note that the first 3 decimals coincide. The cubic root of 1390043 is about 111.6030537912.

Adding to 1390043 its reverse (3400931), we get a palindrome (4790974).

The spelling of 1390043 in words is "one million, three hundred ninety thousand, forty-three".