42851817 has 6 divisors (see below), whose sum is σ = 61897082. Its totient is φ = 28567872.

The previous prime is 42851813. The next prime is 42851867. The reversal of 42851817 is 71815824.

It can be written as a sum of positive squares in only one way, i.e., 37748736 + 5103081 = 6144^2 + 2259^2 .

It is not a de Polignac number, because 42851817 - 2² = 42851813 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42851813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2380648 + ... + 2380665.

Almost surely, 2^42851817 is an apocalyptic number.

It is an amenable number.

42851817 is a deficient number, since it is larger than the sum of its proper divisors (19045265).

42851817 is a wasteful number, since it uses less digits than its factorization.

42851817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4761319 (or 4761316 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 42851817 is about 6546.1299253834. The cubic root of 42851817 is about 349.9369056335.

The spelling of 42851817 in words is "forty-two million, eight hundred fifty-one thousand, eight hundred seventeen".