42390861 has 4 divisors (see below), whose sum is σ = 56521152. Its totient is φ = 28260572.

The previous prime is 42390841. The next prime is 42390871. The reversal of 42390861 is 16809324.

42390861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42390861 - 2⁶ = 42390797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42390841) 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 3 ways as a sum of consecutive naturals, for example, 7065141 + ... + 7065146.

It is an arithmetic number, because the mean of its divisors is an integer number (14130288).

Almost surely, 2^42390861 is an apocalyptic number.

It is an amenable number.

42390861 is a deficient number, since it is larger than the sum of its proper divisors (14130291).

42390861 is a wasteful number, since it uses less digits than its factorization.

42390861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14130290.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 42390861 is about 6510.8264452372. The cubic root of 42390861 is about 348.6776250424.

The spelling of 42390861 in words is "forty-two million, three hundred ninety thousand, eight hundred sixty-one".