42985945 has 16 divisors (see below), whose sum is σ = 54785808. Its totient is φ = 32266240.

The previous prime is 42985879. The next prime is 42985951. The reversal of 42985945 is 54958924.

It can be written as a sum of positive squares in 8 ways, for example, as 683929 + 42302016 = 827^2 + 6504^2 .

It is not a de Polignac number, because 42985945 - 2¹⁵ = 42953177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42985895 and 42985904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38637 + ... + 39733.

It is an arithmetic number, because the mean of its divisors is an integer number (3424113).

Almost surely, 2^42985945 is an apocalyptic number.

It is an amenable number.

42985945 is a deficient number, since it is larger than the sum of its proper divisors (11799863).

42985945 is a wasteful number, since it uses less digits than its factorization.

42985945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580.

The product of its digits is 518400, while the sum is 46.

The square root of 42985945 is about 6556.3667530119. The cubic root of 42985945 is about 350.3016311351.

The spelling of 42985945 in words is "forty-two million, nine hundred eighty-five thousand, nine hundred forty-five".