42641945 has 16 divisors (see below), whose sum is σ = 53557200. Its totient is φ = 32557824.

The previous prime is 42641881. The next prime is 42641969. The reversal of 42641945 is 54914624.

It can be written as a sum of positive squares in 8 ways, for example, as 92416 + 42549529 = 304^2 + 6523^2 .

It is a cyclic number.

It is not a de Polignac number, because 42641945 - 2⁶ = 42641881 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 7631 + ... + 11979.

It is an arithmetic number, because the mean of its divisors is an integer number (3347325).

Almost surely, 2^42641945 is an apocalyptic number.

It is an amenable number.

42641945 is a deficient number, since it is larger than the sum of its proper divisors (10915255).

42641945 is a wasteful number, since it uses less digits than its factorization.

42641945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444.

The product of its digits is 34560, while the sum is 35.

The square root of 42641945 is about 6530.0800148237. The cubic root of 42641945 is about 349.3646842149.

The spelling of 42641945 in words is "forty-two million, six hundred forty-one thousand, nine hundred forty-five".