639713962 has 4 divisors (see below), whose sum is σ = 959570946. Its totient is φ = 319856980.

The previous prime is 639713953. The next prime is 639713969. The reversal of 639713962 is 269317936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 447364801 + 192349161 = 21151^2 + 13869^2 .

It is not an unprimeable number, because it can be changed into a prime (639713969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159928489 + ... + 159928492.

Almost surely, 2^639713962 is an apocalyptic number.

639713962 is a deficient number, since it is larger than the sum of its proper divisors (319856984).

639713962 is a wasteful number, since it uses less digits than its factorization.

639713962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319856983.

The product of its digits is 367416, while the sum is 46.

The square root of 639713962 is about 25292.5673271813. The cubic root of 639713962 is about 861.6454714252.

The spelling of 639713962 in words is "six hundred thirty-nine million, seven hundred thirteen thousand, nine hundred sixty-two".