42090387 has 8 divisors (see below), whose sum is σ = 56162304. Its totient is φ = 28039368.

The previous prime is 42090371. The next prime is 42090401. The reversal of 42090387 is 78309024.

42090387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42090387 - 2⁴ = 42090371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42090787) 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 7 ways as a sum of consecutive naturals, for example, 318 + ... + 9180.

It is an arithmetic number, because the mean of its divisors is an integer number (7020288).

Almost surely, 2^42090387 is an apocalyptic number.

42090387 is a deficient number, since it is larger than the sum of its proper divisors (14071917).

42090387 is a wasteful number, since it uses less digits than its factorization.

42090387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10449.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 42090387 is about 6487.7104590140. The cubic root of 42090387 is about 347.8518410797.

The spelling of 42090387 in words is "forty-two million, ninety thousand, three hundred eighty-seven".