639506213 has 8 divisors (see below), whose sum is σ = 644421600. Its totient is φ = 634603248.

The previous prime is 639506183. The next prime is 639506227. The reversal of 639506213 is 312605936.

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

It is a cyclic number.

It is not a de Polignac number, because 639506213 - 2¹⁶ = 639440677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639506713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117803 + ... + 123111.

It is an arithmetic number, because the mean of its divisors is an integer number (80552700).

Almost surely, 2^639506213 is an apocalyptic number.

It is an amenable number.

639506213 is a deficient number, since it is larger than the sum of its proper divisors (4915387).

639506213 is a wasteful number, since it uses less digits than its factorization.

639506213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6211.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 639506213 is about 25288.4600756946. The cubic root of 639506213 is about 861.5521873551.

The spelling of 639506213 in words is "six hundred thirty-nine million, five hundred six thousand, two hundred thirteen".