42117687 has 24 divisors (see below), whose sum is σ = 65797056. Its totient is φ = 25860096.

The previous prime is 42117671. The next prime is 42117689. The reversal of 42117687 is 78671124.

It is not a de Polignac number, because 42117687 - 2⁴ = 42117671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42117689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4263 + ... + 10119.

It is an arithmetic number, because the mean of its divisors is an integer number (2741544).

Almost surely, 2^42117687 is an apocalyptic number.

42117687 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

42117687 is a deficient number, since it is larger than the sum of its proper divisors (23679369).

42117687 is a wasteful number, since it uses less digits than its factorization.

42117687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5927 (or 5924 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 42117687 is about 6489.8140959507. The cubic root of 42117687 is about 347.9270308760.

It can be divided in two parts, 4 and 2117687, that multiplied together give a palindrome (8470748).

The spelling of 42117687 in words is "forty-two million, one hundred seventeen thousand, six hundred eighty-seven".