42906961 has 4 divisors (see below), whose sum is σ = 42947172. Its totient is φ = 42866752.

The previous prime is 42906949. The next prime is 42906971. The reversal of 42906961 is 16960924.

42906961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8614225 + 34292736 = 2935^2 + 5856^2 .

It is a cyclic number.

It is not a de Polignac number, because 42906961 - 2⁷ = 42906833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42906961.

It is not an unprimeable number, because it can be changed into a prime (42906931) by changing a digit.

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, 18460 + ... + 20653.

It is an arithmetic number, because the mean of its divisors is an integer number (10736793).

Almost surely, 2^42906961 is an apocalyptic number.

It is an amenable number.

42906961 is a deficient number, since it is larger than the sum of its proper divisors (40211).

42906961 is a wasteful number, since it uses less digits than its factorization.

42906961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40210.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 42906961 is about 6550.3405254994. The cubic root of 42906961 is about 350.0869471063.

The spelling of 42906961 in words is "forty-two million, nine hundred six thousand, nine hundred sixty-one".