639266 has 8 divisors (see below), whose sum is σ = 970704. Its totient is φ = 315700.

The previous prime is 639263. The next prime is 639269. The reversal of 639266 is 662936.

639266 is nontrivially palindromic in base 5.

It is an interprime number because it is at equal distance from previous prime (639263) and next prime (639269).

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

It is a super-2 number, since 2×639266² = 817322037512, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6² + 3¹² + 2¹¹ + 9⁵ + 6² + 6⁶ .

It is not an unprimeable number, because it can be changed into a prime (639263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1760 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (121338).

2⁶³⁹²⁶⁶ is an apocalyptic number.

639266 is a deficient number, since it is larger than the sum of its proper divisors (331438).

639266 is a wasteful number, since it uses less digits than its factorization.

639266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936.

The product of its digits is 11664, while the sum is 32.

The square root of 639266 is about 799.5411183923. The cubic root of 639266 is about 86.1444301015.

The spelling of 639266 in words is "six hundred thirty-nine thousand, two hundred sixty-six".