1356689 has 2 divisors, whose sum is σ = 1356690. Its totient is φ = 1356688.

The previous prime is 1356671. The next prime is 1356697. The reversal of 1356689 is 9866531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 146689 = 1100^2 + 383^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356689 - 2¹⁶ = 1291153 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1356629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678344 + 678345.

It is an arithmetic number, because the mean of its divisors is an integer number (678345).

2^1356689 is an apocalyptic number.

It is an amenable number.

1356689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356689 is an equidigital number, since it uses as much as digits as its factorization.

1356689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 1356689 is about 1164.7699343647. The cubic root of 1356689 is about 110.7031812459.

The spelling of 1356689 in words is "one million, three hundred fifty-six thousand, six hundred eighty-nine".