42323991 has 4 divisors (see below), whose sum is σ = 56431992. Its totient is φ = 28215992.

The previous prime is 42323989. The next prime is 42323993. The reversal of 42323991 is 19932324.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42323989) and next prime (42323993).

It is a cyclic number.

It is not a de Polignac number, because 42323991 - 2¹ = 42323989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42323993) 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 3 ways as a sum of consecutive naturals, for example, 7053996 + ... + 7054001.

It is an arithmetic number, because the mean of its divisors is an integer number (14107998).

Almost surely, 2^42323991 is an apocalyptic number.

42323991 is a deficient number, since it is larger than the sum of its proper divisors (14108001).

42323991 is a wasteful number, since it uses less digits than its factorization.

42323991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14108000.

The product of its digits is 11664, while the sum is 33.

The square root of 42323991 is about 6505.6891256807. The cubic root of 42323991 is about 348.4941865758.

The spelling of 42323991 in words is "forty-two million, three hundred twenty-three thousand, nine hundred ninety-one".