354390209 has 4 divisors (see below), whose sum is σ = 354461316. Its totient is φ = 354319104.

The previous prime is 354390191. The next prime is 354390227. The reversal of 354390209 is 902093453.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902093453 = 859 ⋅1050167.

It is an interprime number because it is at equal distance from previous prime (354390191) and next prime (354390227).

It can be written as a sum of positive squares in 2 ways, for example, as 324720400 + 29669809 = 18020^2 + 5447^2 .

It is a cyclic number.

It is not a de Polignac number, because 354390209 - 2¹² = 354386113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (351390209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27464 + ... + 38249.

It is an arithmetic number, because the mean of its divisors is an integer number (88615329).

Almost surely, 2^354390209 is an apocalyptic number.

It is an amenable number.

354390209 is a deficient number, since it is larger than the sum of its proper divisors (71107).

354390209 is an equidigital number, since it uses as much as digits as its factorization.

354390209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71106.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 354390209 is about 18825.2545533918. The cubic root of 354390209 is about 707.6642205581.

The spelling of 354390209 in words is "three hundred fifty-four million, three hundred ninety thousand, two hundred nine".