42208641 has 8 divisors (see below), whose sum is σ = 62531360. Its totient is φ = 28139076.

The previous prime is 42208631. The next prime is 42208667. The reversal of 42208641 is 14680224.

It is not a de Polignac number, because 42208641 - 2⁷ = 42208513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1563283 = 42208641 / (4 + 2 + 2 + 0 + 8 + 6 + 4 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42208631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781615 + ... + 781668.

It is an arithmetic number, because the mean of its divisors is an integer number (7816420).

Almost surely, 2^42208641 is an apocalyptic number.

It is an amenable number.

42208641 is a deficient number, since it is larger than the sum of its proper divisors (20322719).

42208641 is a wasteful number, since it uses less digits than its factorization.

42208641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563292 (or 1563286 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 42208641 is about 6496.8177594881. The cubic root of 42208641 is about 348.1773026352.

Adding to 42208641 its reverse (14680224), we get a palindrome (56888865).

It can be divided in two parts, 42208 and 641, that added together give a square (42849 = 207²).

The spelling of 42208641 in words is "forty-two million, two hundred eight thousand, six hundred forty-one".