349973989 has 4 divisors (see below), whose sum is σ = 353439180. Its totient is φ = 346508800.

The previous prime is 349973971. The next prime is 349973993. The reversal of 349973989 is 989379943.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989379943 = 3761 ⋅263063.

It can be written as a sum of positive squares in 2 ways, for example, as 235376964 + 114597025 = 15342^2 + 10705^2 .

It is a cyclic number.

It is not a de Polignac number, because 349973989 - 2²³ = 341585381 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 (349973959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1732444 + ... + 1732645.

It is an arithmetic number, because the mean of its divisors is an integer number (88359795).

Almost surely, 2^349973989 is an apocalyptic number.

It is an amenable number.

349973989 is a deficient number, since it is larger than the sum of its proper divisors (3465191).

349973989 is a wasteful number, since it uses less digits than its factorization.

349973989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465190.

The product of its digits is 13226976, while the sum is 61.

The square root of 349973989 is about 18707.5917477371. The cubic root of 349973989 is about 704.7124149371.

The spelling of 349973989 in words is "three hundred forty-nine million, nine hundred seventy-three thousand, nine hundred eighty-nine".