42909085 has 16 divisors (see below), whose sum is σ = 53300016. Its totient is φ = 33136128.

The previous prime is 42909043. The next prime is 42909089. The reversal of 42909085 is 58090924.

It can be written as a sum of positive squares in 8 ways, for example, as 840889 + 42068196 = 917^2 + 6486^2 .

It is a cyclic number.

It is not a de Polignac number, because 42909085 - 2¹⁷ = 42778013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42909089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24499 + ... + 26191.

It is an arithmetic number, because the mean of its divisors is an integer number (3331251).

Almost surely, 2^42909085 is an apocalyptic number.

It is an amenable number.

42909085 is a deficient number, since it is larger than the sum of its proper divisors (10390931).

42909085 is a wasteful number, since it uses less digits than its factorization.

42909085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 42909085 is about 6550.5026524687. The cubic root of 42909085 is about 350.0927237323.

The spelling of 42909085 in words is "forty-two million, nine hundred nine thousand, eighty-five".