349640391 has 8 divisors (see below), whose sum is σ = 466362864. Its totient is φ = 233005760.

The previous prime is 349640387. The next prime is 349640393. The reversal of 349640391 is 193046943.

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 349640391 - 2² = 349640387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349640393) 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, 12030 + ... + 29051.

It is an arithmetic number, because the mean of its divisors is an integer number (58295358).

Almost surely, 2^349640391 is an apocalyptic number.

349640391 is a deficient number, since it is larger than the sum of its proper divisors (116722473).

349640391 is a wasteful number, since it uses less digits than its factorization.

349640391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43921.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 349640391 is about 18698.6735091022. The cubic root of 349640391 is about 704.4884312546.

The spelling of 349640391 in words is "three hundred forty-nine million, six hundred forty thousand, three hundred ninety-one".