4228991 has 4 divisors (see below), whose sum is σ = 4554312. Its totient is φ = 3903672.

The previous prime is 4228979. The next prime is 4228993. The reversal of 4228991 is 1998224.

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

It is a cyclic number.

It is not a de Polignac number, because 4228991 - 2¹⁰ = 4227967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4228993) 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, 162641 + ... + 162666.

It is an arithmetic number, because the mean of its divisors is an integer number (1138578).

Almost surely, 2^4228991 is an apocalyptic number.

4228991 is a deficient number, since it is larger than the sum of its proper divisors (325321).

4228991 is a wasteful number, since it uses less digits than its factorization.

4228991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325320.

The product of its digits is 10368, while the sum is 35.

The square root of 4228991 is about 2056.4510691966. The cubic root of 4228991 is about 161.7132431546.

The spelling of 4228991 in words is "four million, two hundred twenty-eight thousand, nine hundred ninety-one".