639146 has 8 divisors (see below), whose sum is σ = 962724. Its totient is φ = 318240.

The previous prime is 639143. The next prime is 639151. The reversal of 639146 is 641936.

It can be written as a sum of positive squares in 2 ways, for example, as 579121 + 60025 = 761^2 + 245^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639146.

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 3 ways as a sum of consecutive naturals, for example, 116 + ... + 1136.

2⁶³⁹¹⁴⁶ is an apocalyptic number.

639146 is a deficient number, since it is larger than the sum of its proper divisors (323578).

639146 is a wasteful number, since it uses less digits than its factorization.

639146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336.

The product of its digits is 3888, while the sum is 29.

The square root of 639146 is about 799.4660718254. The cubic root of 639146 is about 86.1390395555.

The spelling of 639146 in words is "six hundred thirty-nine thousand, one hundred forty-six".