106820409 has 4 divisors (see below), whose sum is σ = 142427216. Its totient is φ = 71213604.

The previous prime is 106820383. The next prime is 106820411. The reversal of 106820409 is 904028601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 106820409 - 2⁹ = 106819897 is a prime.

It is a super-2 number, since 2×106820409² = 22821199557854562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106820429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17803399 + ... + 17803404.

It is an arithmetic number, because the mean of its divisors is an integer number (35606804).

Almost surely, 2^106820409 is an apocalyptic number.

It is an amenable number.

106820409 is a deficient number, since it is larger than the sum of its proper divisors (35606807).

106820409 is an equidigital number, since it uses as much as digits as its factorization.

106820409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35606806.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 106820409 is about 10335.3959285554. The cubic root of 106820409 is about 474.4801833309.

The spelling of 106820409 in words is "one hundred six million, eight hundred twenty thousand, four hundred nine".