1356831 has 20 divisors (see below), whose sum is σ = 2317392. Its totient is φ = 775008.

The previous prime is 1356829. The next prime is 1356857. The reversal of 1356831 is 1386531.

It is not a de Polignac number, because 1356831 - 2¹ = 1356829 is a prime.

It is a super-2 number, since 2×1356831² = 3681980725122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1356795 and 1356804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356811) 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 in 19 ways as a sum of consecutive naturals, for example, 630 + ... + 1763.

2^1356831 is an apocalyptic number.

1356831 is a deficient number, since it is larger than the sum of its proper divisors (960561).

1356831 is an equidigital number, since it uses as much as digits as its factorization.

1356831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412 (or 2403 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1356831 is about 1164.8308890135. The cubic root of 1356831 is about 110.7070434190.

It can be divided in two parts, 1356 and 831, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1356831 in words is "one million, three hundred fifty-six thousand, eight hundred thirty-one".