639149 has 16 divisors (see below), whose sum is σ = 798336. Its totient is φ = 499200.

The previous prime is 639143. The next prime is 639151. The reversal of 639149 is 941936.

It is a cyclic number.

It is not a de Polignac number, because 639149 - 2⁸ = 638893 is a prime.

It is a super-2 number, since 2×639149² = 817022888402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4814 + ... + 4944.

It is an arithmetic number, because the mean of its divisors is an integer number (49896).

2⁶³⁹¹⁴⁹ is an apocalyptic number.

It is an amenable number.

639149 is a deficient number, since it is larger than the sum of its proper divisors (159187).

639149 is a wasteful number, since it uses less digits than its factorization.

639149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its digits is 5832, while the sum is 32.

The square root of 639149 is about 799.4679480755. The cubic root of 639149 is about 86.1391743273.

The spelling of 639149 in words is "six hundred thirty-nine thousand, one hundred forty-nine".