1338639 has 8 divisors (see below), whose sum is σ = 1793280. Its totient is φ = 888216.

The previous prime is 1338637. The next prime is 1338641. The reversal of 1338639 is 9368331.

It is an interprime number because it is at equal distance from previous prime (1338637) and next prime (1338641).

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

It is not a de Polignac number, because 1338639 - 2¹ = 1338637 is a prime.

It is a super-3 number, since 3×1338639³ = 7196340027028233357, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338637) 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, 217 + ... + 1650.

It is an arithmetic number, because the mean of its divisors is an integer number (224160).

2^1338639 is an apocalyptic number.

1338639 is a deficient number, since it is larger than the sum of its proper divisors (454641).

1338639 is a wasteful number, since it uses less digits than its factorization.

1338639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109.

The product of its digits is 11664, while the sum is 33.

The square root of 1338639 is about 1156.9956784708. The cubic root of 1338639 is about 110.2100394563.

The spelling of 1338639 in words is "one million, three hundred thirty-eight thousand, six hundred thirty-nine".