1349821 has 8 divisors (see below), whose sum is σ = 1481184. Its totient is φ = 1219920.

The previous prime is 1349809. The next prime is 1349827. The reversal of 1349821 is 1289431.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1349821 - 2¹⁹ = 825533 is a prime.

It is a Duffinian number.

1349821 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1349821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1349827) 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 7 ways as a sum of consecutive naturals, for example, 2826 + ... + 3268.

It is an arithmetic number, because the mean of its divisors is an integer number (185148).

2^1349821 is an apocalyptic number.

1349821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1349821 is a deficient number, since it is larger than the sum of its proper divisors (131363).

1349821 is a wasteful number, since it uses less digits than its factorization.

1349821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731.

The product of its digits is 1728, while the sum is 28.

The square root of 1349821 is about 1161.8179719732. The cubic root of 1349821 is about 110.5160599904.

The spelling of 1349821 in words is "one million, three hundred forty-nine thousand, eight hundred twenty-one".