42571665 has 12 divisors (see below), whose sum is σ = 73790964. Its totient is φ = 22704864.

The previous prime is 42571631. The next prime is 42571679. The reversal of 42571665 is 56617524.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9290304 + 33281361 = 3048^2 + 5769^2 .

It is not a de Polignac number, because 42571665 - 2¹³ = 42563473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472974 + ... + 473063.

It is an arithmetic number, because the mean of its divisors is an integer number (6149247).

Almost surely, 2^42571665 is an apocalyptic number.

42571665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42571665 is a deficient number, since it is larger than the sum of its proper divisors (31219299).

42571665 is a wasteful number, since it uses less digits than its factorization.

42571665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946048 (or 946045 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 42571665 is about 6524.6965446678. The cubic root of 42571665 is about 349.1726444169.

The spelling of 42571665 in words is "forty-two million, five hundred seventy-one thousand, six hundred sixty-five".