42208917 has 4 divisors (see below), whose sum is σ = 56278560. Its totient is φ = 28139276.

The previous prime is 42208883. The next prime is 42208921. The reversal of 42208917 is 71980224.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42208917 - 2⁶ = 42208853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42208927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7034817 + ... + 7034822.

It is an arithmetic number, because the mean of its divisors is an integer number (14069640).

Almost surely, 2^42208917 is an apocalyptic number.

It is an amenable number.

42208917 is a deficient number, since it is larger than the sum of its proper divisors (14069643).

42208917 is a wasteful number, since it uses less digits than its factorization.

42208917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14069642.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 42208917 is about 6496.8390006218. The cubic root of 42208917 is about 348.1780615377.

The spelling of 42208917 in words is "forty-two million, two hundred eight thousand, nine hundred seventeen".