4218642 has 20 divisors (see below), whose sum is σ = 9453246. Its totient is φ = 1406160.

The previous prime is 4218631. The next prime is 4218667. The reversal of 4218642 is 2468124.

4218642 is a `hidden beast` number, since 4 + 2 + 18 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2653641 + 1565001 = 1629^2 + 1251^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12859 + ... + 13182.

Almost surely, 2^4218642 is an apocalyptic number.

4218642 is an abundant number, since it is smaller than the sum of its proper divisors (5234604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4218642 is a wasteful number, since it uses less digits than its factorization.

4218642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26055 (or 26046 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 4218642 is about 2053.9332997934. The cubic root of 4218642 is about 161.5812229024.

The spelling of 4218642 in words is "four million, two hundred eighteen thousand, six hundred forty-two".