42122391 has 16 divisors (see below), whose sum is σ = 58636128. Its totient is φ = 26870400.

The previous prime is 42122371. The next prime is 42122393. The reversal of 42122391 is 19322124.

42122391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42122391 - 2⁵ = 42122359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42122393) 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 15 ways as a sum of consecutive naturals, for example, 3661 + ... + 9881.

It is an arithmetic number, because the mean of its divisors is an integer number (3664758).

Almost surely, 2^42122391 is an apocalyptic number.

42122391 is a deficient number, since it is larger than the sum of its proper divisors (16513737).

42122391 is a wasteful number, since it uses less digits than its factorization.

42122391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322.

The product of its digits is 864, while the sum is 24.

The square root of 42122391 is about 6490.1764999112. The cubic root of 42122391 is about 347.9399833744.

The spelling of 42122391 in words is "forty-two million, one hundred twenty-two thousand, three hundred ninety-one".