42456390 has 64 divisors (see below), whose sum is σ = 109264896. Its totient is φ = 10530432.

The previous prime is 42456389. The next prime is 42456397. The reversal of 42456390 is 9365424.

42456390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42456397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24699 + ... + 26361.

It is an arithmetic number, because the mean of its divisors is an integer number (1707264).

Almost surely, 2^42456390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42456390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54632448).

42456390 is an abundant number, since it is smaller than the sum of its proper divisors (66808506).

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

42456390 is a wasteful number, since it uses less digits than its factorization.

42456390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 42456390 is about 6515.8568124231. The cubic root of 42456390 is about 348.8571978117.

The spelling of 42456390 in words is "forty-two million, four hundred fifty-six thousand, three hundred ninety".