1356749 has 4 divisors (see below), whose sum is σ = 1385664. Its totient is φ = 1327836.

The previous prime is 1356743. The next prime is 1356757. The reversal of 1356749 is 9476531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9476531 = 17 ⋅557443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1356749 is a prime.

It is a d-powerful number, because it can be written as 1 + 3¹² + 5 + 6 + 7⁷ + 4⁵ + 9³ .

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14387 + ... + 14480.

It is an arithmetic number, because the mean of its divisors is an integer number (346416).

2^1356749 is an apocalyptic number.

It is an amenable number.

1356749 is a deficient number, since it is larger than the sum of its proper divisors (28915).

1356749 is an equidigital number, since it uses as much as digits as its factorization.

1356749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28914.

The product of its digits is 22680, while the sum is 35.

The square root of 1356749 is about 1164.7956902393. The cubic root of 1356749 is about 110.7048131829.

It can be divided in two parts, 13 and 56749, that multiplied together give a palindrome (737737).

The spelling of 1356749 in words is "one million, three hundred fifty-six thousand, seven hundred forty-nine".