42870665 has 4 divisors (see below), whose sum is σ = 51444804. Its totient is φ = 34296528.

The previous prime is 42870661. The next prime is 42870691. The reversal of 42870665 is 56607824.

It is a happy number.

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 9369721 + 33500944 = 3061^2 + 5788^2 .

It is a cyclic number.

It is not a de Polignac number, because 42870665 - 2² = 42870661 is a prime.

It is a super-3 number, since 3×42870665³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42870661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4287062 + ... + 4287071.

It is an arithmetic number, because the mean of its divisors is an integer number (12861201).

Almost surely, 2^42870665 is an apocalyptic number.

It is an amenable number.

42870665 is a deficient number, since it is larger than the sum of its proper divisors (8574139).

42870665 is an equidigital number, since it uses as much as digits as its factorization.

42870665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8574138.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 42870665 is about 6547.5693963485. The cubic root of 42870665 is about 349.9882036841.

The spelling of 42870665 in words is "forty-two million, eight hundred seventy thousand, six hundred sixty-five".