42220897 has 4 divisors (see below), whose sum is σ = 43676820. Its totient is φ = 40764976.

The previous prime is 42220837. The next prime is 42220903. The reversal of 42220897 is 79802224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7834401 + 34386496 = 2799^2 + 5864^2 .

It is a cyclic number.

It is not a de Polignac number, because 42220897 - 2¹¹ = 42218849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42220837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 727918 + ... + 727975.

It is an arithmetic number, because the mean of its divisors is an integer number (10919205).

Almost surely, 2^42220897 is an apocalyptic number.

It is an amenable number.

42220897 is a deficient number, since it is larger than the sum of its proper divisors (1455923).

42220897 is a wasteful number, since it uses less digits than its factorization.

42220897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1455922.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 42220897 is about 6497.7609220408. The cubic root of 42220897 is about 348.2109991167.

The spelling of 42220897 in words is "forty-two million, two hundred twenty thousand, eight hundred ninety-seven".