1356857 has 2 divisors, whose sum is σ = 1356858. Its totient is φ = 1356856.

The previous prime is 1356829. The next prime is 1356869. The reversal of 1356857 is 7586531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 59536 = 1139^2 + 244^2 .

It is an emirp because it is prime and its reverse (7586531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1356857 - 2¹² = 1352761 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1356877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678428 + 678429.

It is an arithmetic number, because the mean of its divisors is an integer number (678429).

2^1356857 is an apocalyptic number.

It is an amenable number.

1356857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356857 is an equidigital number, since it uses as much as digits as its factorization.

1356857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 35.

The square root of 1356857 is about 1164.8420493784. The cubic root of 1356857 is about 110.7077505483.

The spelling of 1356857 in words is "one million, three hundred fifty-six thousand, eight hundred fifty-seven".