349991672 has 8 divisors (see below), whose sum is σ = 656234400. Its totient is φ = 174995832.

The previous prime is 349991671. The next prime is 349991683. The reversal of 349991672 is 276199943.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 349991672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349991671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21874472 + ... + 21874487.

It is an arithmetic number, because the mean of its divisors is an integer number (82029300).

Almost surely, 2^349991672 is an apocalyptic number.

It is an amenable number.

349991672 is a deficient number, since it is larger than the sum of its proper divisors (306242728).

349991672 is a wasteful number, since it uses less digits than its factorization.

349991672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43748965 (or 43748961 counting only the distinct ones).

The product of its digits is 734832, while the sum is 50.

The square root of 349991672 is about 18708.0643573834. The cubic root of 349991672 is about 704.7242836475.

The spelling of 349991672 in words is "three hundred forty-nine million, nine hundred ninety-one thousand, six hundred seventy-two".