42042780 has 192 divisors, whose sum is σ = 144789120. Its totient is φ = 10063872.

The previous prime is 42042743. The next prime is 42042809. The reversal of 42042780 is 8724024.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 372004 + ... + 372116.

It is an arithmetic number, because the mean of its divisors is an integer number (754110).

Almost surely, 2^42042780 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 42042780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72394560).

42042780 is an abundant number, since it is smaller than the sum of its proper divisors (102746340).

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

42042780 is a wasteful number, since it uses less digits than its factorization.

42042780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 42042780 is about 6484.0404070302. The cubic root of 42042780 is about 347.7206438218.

The spelling of 42042780 in words is "forty-two million, forty-two thousand, seven hundred eighty".