42389820 has 144 divisors (see below), whose sum is σ = 142571520. Its totient is φ = 10108800.

The previous prime is 42389797. The next prime is 42389833. The reversal of 42389820 is 2898324.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156285 + ... + 156555.

It is an arithmetic number, because the mean of its divisors is an integer number (990080).

Almost surely, 2^42389820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42389820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71285760).

42389820 is an abundant number, since it is smaller than the sum of its proper divisors (100181700).

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

42389820 is a wasteful number, since it uses less digits than its factorization.

42389820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 42389820 is about 6510.7465009782. The cubic root of 42389820 is about 348.6747708394.

The spelling of 42389820 in words is "forty-two million, three hundred eighty-nine thousand, eight hundred twenty".