42004420 has 12 divisors (see below), whose sum is σ = 88209324. Its totient is φ = 16801760.

The previous prime is 42004409. The next prime is 42004423. The reversal of 42004420 is 2440024.

It can be written as a sum of positive squares in 2 ways, for example, as 19289664 + 22714756 = 4392^2 + 4766^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42004394 and 42004403.

It is not an unprimeable number, because it can be changed into a prime (42004423) 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, 1050091 + ... + 1050130.

It is an arithmetic number, because the mean of its divisors is an integer number (7350777).

Almost surely, 2^42004420 is an apocalyptic number.

It is an amenable number.

42004420 is an abundant number, since it is smaller than the sum of its proper divisors (46204904).

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

42004420 is a wasteful number, since it uses less digits than its factorization.

42004420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100230 (or 2100228 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 42004420 is about 6481.0816998399. The cubic root of 42004420 is about 347.6148577417.

Adding to 42004420 its reverse (2440024), we get a palindrome (44444444).

It can be divided in two parts, 42004 and 420, that added together give a palindrome (42424).

The spelling of 42004420 in words is "forty-two million, four thousand, four hundred twenty".