349755021 has 96 divisors (see below), whose sum is σ = 672122880. Its totient is φ = 169776000.

The previous prime is 349755019. The next prime is 349755047. The reversal of 349755021 is 120557943.

It is not a de Polignac number, because 349755021 - 2¹ = 349755019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349755011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1329736 + ... + 1329998.

It is an arithmetic number, because the mean of its divisors is an integer number (7001280).

Almost surely, 2^349755021 is an apocalyptic number.

It is an amenable number.

349755021 is a deficient number, since it is larger than the sum of its proper divisors (322367859).

349755021 is a wasteful number, since it uses less digits than its factorization.

349755021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 349755021 is about 18701.7384486042. The cubic root of 349755021 is about 704.5654119537.

The spelling of 349755021 in words is "three hundred forty-nine million, seven hundred fifty-five thousand, twenty-one".