349705639 has 8 divisors (see below), whose sum is σ = 368323200. Its totient is φ = 331372536.

The previous prime is 349705571. The next prime is 349705651. The reversal of 349705639 is 936507943.

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 349705639 - 2¹⁵ = 349672871 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 (349705669) 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, 68589 + ... + 73510.

It is an arithmetic number, because the mean of its divisors is an integer number (46040400).

Almost surely, 2^349705639 is an apocalyptic number.

349705639 is a deficient number, since it is larger than the sum of its proper divisors (18617561).

349705639 is a wasteful number, since it uses less digits than its factorization.

349705639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142229.

The product of its (nonzero) digits is 612360, while the sum is 46.

The square root of 349705639 is about 18700.4181504051. The cubic root of 349705639 is about 704.5322511367.

The spelling of 349705639 in words is "three hundred forty-nine million, seven hundred five thousand, six hundred thirty-nine".