1239001 has 2 divisors, whose sum is σ = 1239002. Its totient is φ = 1239000.

The previous prime is 1238999. The next prime is 1239013. The reversal of 1239001 is 1009321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1157776 + 81225 = 1076^2 + 285^2 .

It is an emirp because it is prime and its reverse (1009321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1239001 - 2¹ = 1238999 is a prime.

Together with 1238999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1239041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619500 + 619501.

It is an arithmetic number, because the mean of its divisors is an integer number (619501).

2^1239001 is an apocalyptic number.

It is an amenable number.

1239001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239001 is an equidigital number, since it uses as much as digits as its factorization.

1239001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1239001 is about 1113.1042179419. The cubic root of 1239001 is about 107.4048481987.

The spelling of 1239001 in words is "one million, two hundred thirty-nine thousand, one".