352989821 has 4 divisors (see below), whose sum is σ = 357825372. Its totient is φ = 348154272.

The previous prime is 352989817. The next prime is 352989823. The reversal of 352989821 is 128989253.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128989253 = 509 ⋅253417.

It can be written as a sum of positive squares in 2 ways, for example, as 75933796 + 277056025 = 8714^2 + 16645^2 .

It is a cyclic number.

It is not a de Polignac number, because 352989821 - 2² = 352989817 is a prime.

It is a super-2 number, since 2×352989821² = 249203627459224082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (352989823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2417666 + ... + 2417811.

It is an arithmetic number, because the mean of its divisors is an integer number (89456343).

Almost surely, 2^352989821 is an apocalyptic number.

It is an amenable number.

352989821 is a deficient number, since it is larger than the sum of its proper divisors (4835551).

352989821 is an equidigital number, since it uses as much as digits as its factorization.

352989821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835550.

The product of its digits is 311040, while the sum is 47.

The square root of 352989821 is about 18788.0233393511. The cubic root of 352989821 is about 706.7308683166.

The spelling of 352989821 in words is "three hundred fifty-two million, nine hundred eighty-nine thousand, eight hundred twenty-one".