738639 has 20 divisors (see below), whose sum is σ = 1205160. Its totient is φ = 447120.

The previous prime is 738623. The next prime is 738643. The reversal of 738639 is 936837.

It is not a de Polignac number, because 738639 - 2⁴ = 738623 is a prime.

It is a super-3 number, since 3×738639³ = 1208976776494833357, which contains 333 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 738639.

It is not an unprimeable number, because it can be changed into a prime (738539) 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 19 ways as a sum of consecutive naturals, for example, 477 + ... + 1305.

It is an arithmetic number, because the mean of its divisors is an integer number (60258).

2⁷³⁸⁶³⁹ is an apocalyptic number.

738639 is a deficient number, since it is larger than the sum of its proper divisors (466521).

738639 is a wasteful number, since it uses less digits than its factorization.

738639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 843 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 738639 is about 859.4410974581. The cubic root of 738639 is about 90.3949311252.

The spelling of 738639 in words is "seven hundred thirty-eight thousand, six hundred thirty-nine".