349969921 has 8 divisors (see below), whose sum is σ = 405029120. Its totient is φ = 296176608.

The previous prime is 349969913. The next prime is 349969933. The reversal of 349969921 is 129969943.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 349969921 - 2³ = 349969913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (349969951) 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, 315876 + ... + 316981.

It is an arithmetic number, because the mean of its divisors is an integer number (50628640).

Almost surely, 2^349969921 is an apocalyptic number.

It is an amenable number.

349969921 is a deficient number, since it is larger than the sum of its proper divisors (55059199).

349969921 is an equidigital number, since it uses as much as digits as its factorization.

349969921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632943.

The product of its digits is 944784, while the sum is 52.

The square root of 349969921 is about 18707.4830215077. The cubic root of 349969921 is about 704.7096844664.

The spelling of 349969921 in words is "three hundred forty-nine million, nine hundred sixty-nine thousand, nine hundred twenty-one".