1339021 has 4 divisors (see below), whose sum is σ = 1341472. Its totient is φ = 1336572.

The previous prime is 1339003. The next prime is 1339027. The reversal of 1339021 is 1209331.

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: 1209331 = 19 ⋅63649.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1339021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1339021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1339027) 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 3 ways as a sum of consecutive naturals, for example, 10 + ... + 1636.

It is an arithmetic number, because the mean of its divisors is an integer number (335368).

2^1339021 is an apocalyptic number.

It is an amenable number.

1339021 is a deficient number, since it is larger than the sum of its proper divisors (2451).

1339021 is an equidigital number, since it uses as much as digits as its factorization.

1339021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 1339021 is about 1157.1607494208. The cubic root of 1339021 is about 110.2205218022.

It can be divided in two parts, 133902 and 1, that added together give a triangular number (133903 = T₅₁₇).

The spelling of 1339021 in words is "one million, three hundred thirty-nine thousand, twenty-one".