1538321 has 2 divisors, whose sum is σ = 1538322. Its totient is φ = 1538320.

The previous prime is 1538311. The next prime is 1538353. The reversal of 1538321 is 1238351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1345600 + 192721 = 1160^2 + 439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538321 - 2¹⁴ = 1521937 is a prime.

It is a Chen prime.

It is equal to p₁₁₆₈₅₂ and since 1538321 and 116852 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1538311) 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 as a sum of consecutive naturals, namely, 769160 + 769161.

It is an arithmetic number, because the mean of its divisors is an integer number (769161).

2^1538321 is an apocalyptic number.

It is an amenable number.

1538321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538321 is an equidigital number, since it uses as much as digits as its factorization.

1538321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 1538321 is about 1240.2906917332. The cubic root of 1538321 is about 115.4380520237.

The spelling of 1538321 in words is "one million, five hundred thirty-eight thousand, three hundred twenty-one".