4220918 has 8 divisors (see below), whose sum is σ = 6818448. Its totient is φ = 1948104.

The previous prime is 4220917. The next prime is 4220927. The reversal of 4220918 is 8190224.

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

It is a super-2 number, since 2×4220918² = 35632297525448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 162343 = 4220918 / (4 + 2 + 2 + 0 + 9 + 1 + 8).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4220911) 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, 81146 + ... + 81197.

It is an arithmetic number, because the mean of its divisors is an integer number (852306).

Almost surely, 2^4220918 is an apocalyptic number.

4220918 is a deficient number, since it is larger than the sum of its proper divisors (2597530).

4220918 is a wasteful number, since it uses less digits than its factorization.

4220918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162358.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 4220918 is about 2054.4872839714. The cubic root of 4220918 is about 161.6102759126.

The spelling of 4220918 in words is "four million, two hundred twenty thousand, nine hundred eighteen".