42117645 has 16 divisors (see below), whose sum is σ = 67921920. Its totient is φ = 22284864.

The previous prime is 42117643. The next prime is 42117659. The reversal of 42117645 is 54671124.

It is not a de Polignac number, because 42117645 - 2¹ = 42117643 is a prime.

It is a super-3 number, since 3×42117645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42117643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9150 + ... + 12959.

It is an arithmetic number, because the mean of its divisors is an integer number (4245120).

Almost surely, 2^42117645 is an apocalyptic number.

It is an amenable number.

42117645 is a deficient number, since it is larger than the sum of its proper divisors (25804275).

42117645 is a wasteful number, since it uses less digits than its factorization.

42117645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22244.

The product of its digits is 6720, while the sum is 30.

The square root of 42117645 is about 6489.8108601099. The cubic root of 42117645 is about 347.9269152243.

Adding to 42117645 its reverse (54671124), we get a palindrome (96788769).

The spelling of 42117645 in words is "forty-two million, one hundred seventeen thousand, six hundred forty-five".