42870945 has 16 divisors (see below), whose sum is σ = 73870272. Its totient is φ = 21105600.

The previous prime is 42870931. The next prime is 42870967. The reversal of 42870945 is 54907824.

It is not a de Polignac number, because 42870945 - 2⁵ = 42870913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 109731 + ... + 110120.

It is an arithmetic number, because the mean of its divisors is an integer number (4616892).

Almost surely, 2^42870945 is an apocalyptic number.

It is an amenable number.

42870945 is a deficient number, since it is larger than the sum of its proper divisors (30999327).

42870945 is a wasteful number, since it uses less digits than its factorization.

42870945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219872.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 42870945 is about 6547.5907782940. The cubic root of 42870945 is about 349.9889656385.

The spelling of 42870945 in words is "forty-two million, eight hundred seventy thousand, nine hundred forty-five".