42639285 has 32 divisors (see below), whose sum is σ = 73785600. Its totient is φ = 20901888.

The previous prime is 42639283. The next prime is 42639299. The reversal of 42639285 is 58293624.

It is a happy number.

It is not a de Polignac number, because 42639285 - 2¹ = 42639283 is a prime.

It is a super-2 number, since 2×42639285² = 3636217250622450, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42639283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87312 + ... + 87798.

It is an arithmetic number, because the mean of its divisors is an integer number (2305800).

Almost surely, 2^42639285 is an apocalyptic number.

It is an amenable number.

42639285 is a deficient number, since it is larger than the sum of its proper divisors (31146315).

42639285 is a wasteful number, since it uses less digits than its factorization.

42639285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957.

The product of its digits is 103680, while the sum is 39.

The square root of 42639285 is about 6529.8763387985. The cubic root of 42639285 is about 349.3574196199.

It can be divided in two parts, 42639 and 285, that added together give a palindrome (42924).

The spelling of 42639285 in words is "forty-two million, six hundred thirty-nine thousand, two hundred eighty-five".