4020642 has 24 divisors (see below), whose sum is σ = 8948316. Its totient is φ = 1303776.

The previous prime is 4020641. The next prime is 4020671. The reversal of 4020642 is 2460204.

4020642 is a `hidden beast` number, since 4 + 0 + 20 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4004001 + 16641 = 2001^2 + 129^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (4020641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2353 + ... + 3684.

Almost surely, 2^4020642 is an apocalyptic number.

4020642 is an abundant number, since it is smaller than the sum of its proper divisors (4927674).

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

4020642 is a wasteful number, since it uses less digits than its factorization.

4020642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6082 (or 6079 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 4020642 is about 2005.1538594332. The cubic root of 4020642 is about 159.0126962687.

Adding to 4020642 its reverse (2460204), we get a palindrome (6480846).

The spelling of 4020642 in words is "four million, twenty thousand, six hundred forty-two".