639993354 has 256 divisors, whose sum is σ = 1853300736. Its totient is φ = 141926400.

The previous prime is 639993323. The next prime is 639993371. The reversal of 639993354 is 453399936.

It is a junction number, because it is equal to n+sod(n) for n = 639993297 and 639993306.

It is an unprimeable number.

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 in 127 ways as a sum of consecutive naturals, for example, 5663602 + ... + 5663714.

It is an arithmetic number, because the mean of its divisors is an integer number (7239456).

Almost surely, 2^639993354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639993354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926650368).

639993354 is an abundant number, since it is smaller than the sum of its proper divisors (1213307382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639993354 is a wasteful number, since it uses less digits than its factorization.

639993354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213.

The product of its digits is 2361960, while the sum is 51.

The square root of 639993354 is about 25298.0899278977. The cubic root of 639993354 is about 861.7708930081.

The spelling of 639993354 in words is "six hundred thirty-nine million, nine hundred ninety-three thousand, three hundred fifty-four".