42216257 has 8 divisors (see below), whose sum is σ = 44227200. Its totient is φ = 40242384.

The previous prime is 42216217. The next prime is 42216277. The reversal of 42216257 is 75261224.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42216257 - 2⁶ = 42216193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42216217) 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, 6923 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (5528400).

Almost surely, 2^42216257 is an apocalyptic number.

It is an amenable number.

42216257 is a deficient number, since it is larger than the sum of its proper divisors (2010943).

42216257 is a wasteful number, since it uses less digits than its factorization.

42216257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18535.

The product of its digits is 6720, while the sum is 29.

The square root of 42216257 is about 6497.4038661607. The cubic root of 42216257 is about 348.1982427303.

The spelling of 42216257 in words is "forty-two million, two hundred sixteen thousand, two hundred fifty-seven".