639952167 has 8 divisors (see below), whose sum is σ = 898178560. Its totient is φ = 404180280.

The previous prime is 639952163. The next prime is 639952171. The reversal of 639952167 is 761259936.

It is an interprime number because it is at equal distance from previous prime (639952163) and next prime (639952171).

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

It is not a de Polignac number, because 639952167 - 2² = 639952163 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 (639952163) 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, 5613559 + ... + 5613672.

It is an arithmetic number, because the mean of its divisors is an integer number (112272320).

Almost surely, 2^639952167 is an apocalyptic number.

639952167 is a deficient number, since it is larger than the sum of its proper divisors (258226393).

639952167 is a wasteful number, since it uses less digits than its factorization.

639952167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11227253.

The product of its digits is 612360, while the sum is 48.

The square root of 639952167 is about 25297.2758810114. The cubic root of 639952167 is about 861.7524060873.

The spelling of 639952167 in words is "six hundred thirty-nine million, nine hundred fifty-two thousand, one hundred sixty-seven".