42381820 has 36 divisors (see below), whose sum is σ = 96382440. Its totient is φ = 15647424.

The previous prime is 42381811. The next prime is 42381839. The reversal of 42381820 is 2818324.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2890 + ... + 9649.

It is an arithmetic number, because the mean of its divisors is an integer number (2677290).

Almost surely, 2^42381820 is an apocalyptic number.

It is an amenable number.

42381820 is an abundant number, since it is smaller than the sum of its proper divisors (54000620).

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

42381820 is a wasteful number, since it uses less digits than its factorization.

42381820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12574 (or 12559 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 42381820 is about 6510.1321031143. The cubic root of 42381820 is about 348.6528349621.

The spelling of 42381820 in words is "forty-two million, three hundred eighty-one thousand, eight hundred twenty".