1356869 has 2 divisors, whose sum is σ = 1356870. Its totient is φ = 1356868.

The previous prime is 1356857. The next prime is 1356871. The reversal of 1356869 is 9686531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288225 + 68644 = 1135^2 + 262^2 .

It is an emirp because it is prime and its reverse (9686531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1356869 - 2¹² = 1352773 is a prime.

It is a super-2 number, since 2×1356869² = 3682186966322, which contains 22 as substring.

Together with 1356871, 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 (1356829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678434 + 678435.

It is an arithmetic number, because the mean of its divisors is an integer number (678435).

2^1356869 is an apocalyptic number.

It is an amenable number.

1356869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356869 is an equidigital number, since it uses as much as digits as its factorization.

1356869 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1356869 is about 1164.8472002799. The cubic root of 1356869 is about 110.7080769126.

The spelling of 1356869 in words is "one million, three hundred fifty-six thousand, eight hundred sixty-nine".