639823546 has 8 divisors (see below), whose sum is σ = 965283444. Its totient is φ = 318062400.

The previous prime is 639823523. The next prime is 639823603. The reversal of 639823546 is 645328936.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 570684321 + 69139225 = 23889^2 + 8315^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 639823496 and 639823505.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924255 + ... + 924946.

Almost surely, 2^639823546 is an apocalyptic number.

639823546 is a deficient number, since it is larger than the sum of its proper divisors (325459898).

639823546 is a wasteful number, since it uses less digits than its factorization.

639823546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849376.

The product of its digits is 933120, while the sum is 46.

The square root of 639823546 is about 25294.7335625422. The cubic root of 639823546 is about 861.6946690207.

It can be divided in two parts, 63982 and 3546, that added together give a triangular number (67528 = T₃₆₇).

The spelling of 639823546 in words is "six hundred thirty-nine million, eight hundred twenty-three thousand, five hundred forty-six".