42353991 has 12 divisors (see below), whose sum is σ = 61425000. Its totient is φ = 28122000.

The previous prime is 42353989. The next prime is 42354001. The reversal of 42353991 is 19935324.

It is a happy number.

It is not a de Polignac number, because 42353991 - 2¹ = 42353989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42353911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7116 + ... + 11633.

It is an arithmetic number, because the mean of its divisors is an integer number (5118750).

Almost surely, 2^42353991 is an apocalyptic number.

42353991 is a deficient number, since it is larger than the sum of its proper divisors (19071009).

42353991 is a wasteful number, since it uses less digits than its factorization.

42353991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19006 (or 19003 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 42353991 is about 6507.9943915157. The cubic root of 42353991 is about 348.5765067614.

The spelling of 42353991 in words is "forty-two million, three hundred fifty-three thousand, nine hundred ninety-one".