346221990 has 96 divisors (see below), whose sum is σ = 988865280. Its totient is φ = 83654208.

The previous prime is 346221977. The next prime is 346222021. The reversal of 346221990 is 99122643.

346221990 is a `hidden beast` number, since 3 + 462 + 2 + 199 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34929 + ... + 43731.

It is an arithmetic number, because the mean of its divisors is an integer number (10300680).

Almost surely, 2^346221990 is an apocalyptic number.

346221990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 346221990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (494432640).

346221990 is an abundant number, since it is smaller than the sum of its proper divisors (642643290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

346221990 is a wasteful number, since it uses less digits than its factorization.

346221990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8858 (or 8855 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 346221990 is about 18607.0414091010. The cubic root of 346221990 is about 702.1850024985.

It can be divided in two parts, 3462 and 21990, that added together give a palindrome (25452).

The spelling of 346221990 in words is "three hundred forty-six million, two hundred twenty-one thousand, nine hundred ninety".