42838820 has 12 divisors (see below), whose sum is σ = 89961564. Its totient is φ = 17135520.

The previous prime is 42838813. The next prime is 42838823. The reversal of 42838820 is 2883824.

It can be written as a sum of positive squares in 2 ways, for example, as 16192576 + 26646244 = 4024^2 + 5162^2 .

It is not an unprimeable number, because it can be changed into a prime (42838823) 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, 1070951 + ... + 1070990.

It is an arithmetic number, because the mean of its divisors is an integer number (7496797).

Almost surely, 2^42838820 is an apocalyptic number.

It is an amenable number.

42838820 is an abundant number, since it is smaller than the sum of its proper divisors (47122744).

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

42838820 is a wasteful number, since it uses less digits than its factorization.

42838820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141950 (or 2141948 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 42838820 is about 6545.1371261418. The cubic root of 42838820 is about 349.9015233154.

The spelling of 42838820 in words is "forty-two million, eight hundred thirty-eight thousand, eight hundred twenty".