42009764 has 6 divisors (see below), whose sum is σ = 73517094. Its totient is φ = 21004880.

The previous prime is 42009739. The next prime is 42009769. The reversal of 42009764 is 46790024.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 19731364 = 4720^2 + 4442^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42009764.

It is not an unprimeable number, because it can be changed into a prime (42009769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5251217 + ... + 5251224.

It is an arithmetic number, because the mean of its divisors is an integer number (12252849).

Almost surely, 2^42009764 is an apocalyptic number.

It is an amenable number.

42009764 is a deficient number, since it is larger than the sum of its proper divisors (31507330).

42009764 is a wasteful number, since it uses less digits than its factorization.

42009764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10502445 (or 10502443 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 42009764 is about 6481.4939635859. The cubic root of 42009764 is about 347.6295988493.

Adding to 42009764 its reverse (46790024), we get a palindrome (88799788).

The spelling of 42009764 in words is "forty-two million, nine thousand, seven hundred sixty-four".