4020042 has 16 divisors (see below), whose sum is σ = 8658720. Its totient is φ = 1236912.

The previous prime is 4020031. The next prime is 4020119. The reversal of 4020042 is 2400204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25692 + ... + 25847.

It is an arithmetic number, because the mean of its divisors is an integer number (541170).

Almost surely, 2^4020042 is an apocalyptic number.

4020042 is an abundant number, since it is smaller than the sum of its proper divisors (4638678).

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

4020042 is a wasteful number, since it uses less digits than its factorization.

4020042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51557.

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 4020042 is about 2005.0042393970. The cubic root of 4020042 is about 159.0047860590.

Subtracting from 4020042 its sum of digits (12), we obtain a triangular number (4020030 = T₂₈₃₅).

Adding to 4020042 its reverse (2400204), we get a palindrome (6420246).

The spelling of 4020042 in words is "four million, twenty thousand, forty-two".