106405906 has 8 divisors (see below), whose sum is σ = 163501884. Its totient is φ = 51905280.

The previous prime is 106405883. The next prime is 106405921. The reversal of 106405906 is 609504601.

It can be written as a sum of positive squares in 2 ways, for example, as 89472681 + 16933225 = 9459^2 + 4115^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×106405906² = 22644433663361672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648735 + ... + 648898.

Almost surely, 2^106405906 is an apocalyptic number.

106405906 is a deficient number, since it is larger than the sum of its proper divisors (57095978).

106405906 is a wasteful number, since it uses less digits than its factorization.

106405906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297676.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 106405906 is about 10315.3238436803. The cubic root of 106405906 is about 473.8656678094.

The spelling of 106405906 in words is "one hundred six million, four hundred five thousand, nine hundred six".