1356381 has 12 divisors (see below), whose sum is σ = 2110108. Its totient is φ = 834624.

The previous prime is 1356371. The next prime is 1356389. The reversal of 1356381 is 1836531.

It can be written as a sum of positive squares in 2 ways, for example, as 793881 + 562500 = 891^2 + 750^2 .

It is not a de Polignac number, because 1356381 - 2⁷ = 1356253 is a prime.

It is a super-2 number, since 2×1356381² = 3679538834322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356389) 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 11 ways as a sum of consecutive naturals, for example, 5680 + ... + 5913.

2^1356381 is an apocalyptic number.

It is an amenable number.

1356381 is a deficient number, since it is larger than the sum of its proper divisors (753727).

1356381 is a wasteful number, since it uses less digits than its factorization.

1356381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11612 (or 11609 counting only the distinct ones).

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

The square root of 1356381 is about 1164.6377119087. The cubic root of 1356381 is about 110.6948032118.

It can be divided in two parts, 1356 and 381, that multiplied together give a triangular number (516636 = T₁₀₁₆).

The spelling of 1356381 in words is "one million, three hundred fifty-six thousand, three hundred eighty-one".