4221957 has 4 divisors (see below), whose sum is σ = 5629280. Its totient is φ = 2814636.

The previous prime is 4221953. The next prime is 4221977. The reversal of 4221957 is 7591224.

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 not a de Polignac number, because 4221957 - 2² = 4221953 is a prime.

It is a D-number.

It is a Duffinian number.

4221957 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703657 + ... + 703662.

It is an arithmetic number, because the mean of its divisors is an integer number (1407320).

Almost surely, 2^4221957 is an apocalyptic number.

It is an amenable number.

4221957 is a deficient number, since it is larger than the sum of its proper divisors (1407323).

4221957 is a wasteful number, since it uses less digits than its factorization.

4221957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407322.

The product of its digits is 5040, while the sum is 30.

The square root of 4221957 is about 2054.7401295541. The cubic root of 4221957 is about 161.6235352163.

The spelling of 4221957 in words is "four million, two hundred twenty-one thousand, nine hundred fifty-seven".