4242439845 has 72 divisors (see below), whose sum is σ = 9057408984. Its totient is φ = 1825302528.

The previous prime is 4242439843. The next prime is 4242439849. The reversal of 4242439845 is 5489342424.

It can be written as a sum of positive squares in 4 ways, for example, as 75220929 + 4167218916 = 8673^2 + 64554^2 .

It is not a de Polignac number, because 4242439845 - 2¹ = 4242439843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 4242439845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4242439843) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19104 + ... + 94073.

It is an arithmetic number, because the mean of its divisors is an integer number (125797347).

Almost surely, 2^4242439845 is an apocalyptic number.

4242439845 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4242439845 is an abundant number, since it is smaller than the sum of its proper divisors (4814969139).

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

4242439845 is a wasteful number, since it uses less digits than its factorization.

4242439845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113219 (or 113209 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 4242439845 is about 65134.0145008735. The cubic root of 4242439845 is about 1618.8448612536.

The spelling of 4242439845 in words is "four billion, two hundred forty-two million, four hundred thirty-nine thousand, eight hundred forty-five".