105991478 has 8 divisors (see below), whose sum is σ = 162865080. Its totient is φ = 51703120.

The previous prime is 105991469. The next prime is 105991513. The reversal of 105991478 is 874199501.

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

It is a super-2 number, since 2×105991478² = 22468386817248968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 646208 + ... + 646371.

It is an arithmetic number, because the mean of its divisors is an integer number (20358135).

Almost surely, 2^105991478 is an apocalyptic number.

105991478 is a deficient number, since it is larger than the sum of its proper divisors (56873602).

105991478 is a wasteful number, since it uses less digits than its factorization.

105991478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292622.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 105991478 is about 10295.2162677624. The cubic root of 105991478 is about 473.2496659408.

The spelling of 105991478 in words is "one hundred five million, nine hundred ninety-one thousand, four hundred seventy-eight".