639145693 has 8 divisors (see below), whose sum is σ = 694488320. Its totient is φ = 585973440.

The previous prime is 639145691. The next prime is 639145723. The reversal of 639145693 is 396541936.

639145693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 639145693 - 2¹ = 639145691 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 (639145691) 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, 541980 + ... + 543157.

It is an arithmetic number, because the mean of its divisors is an integer number (86811040).

Almost surely, 2^639145693 is an apocalyptic number.

It is an amenable number.

639145693 is a deficient number, since it is larger than the sum of its proper divisors (55342627).

639145693 is a wasteful number, since it uses less digits than its factorization.

639145693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085187.

The product of its digits is 524880, while the sum is 46.

The square root of 639145693 is about 25281.3309182883. The cubic root of 639145693 is about 861.3902576378.

The spelling of 639145693 in words is "six hundred thirty-nine million, one hundred forty-five thousand, six hundred ninety-three".