42661993 has 8 divisors (see below), whose sum is σ = 49278240. Its totient is φ = 36502080.

The previous prime is 42661981. The next prime is 42662021. The reversal of 42661993 is 39916624.

42661993 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 a cyclic number.

It is not a de Polignac number, because 42661993 - 2⁵ = 42661961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42661903) 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, 113883 + ... + 114256.

It is an arithmetic number, because the mean of its divisors is an integer number (6159780).

Almost surely, 2^42661993 is an apocalyptic number.

It is an amenable number.

42661993 is a deficient number, since it is larger than the sum of its proper divisors (6616247).

42661993 is a wasteful number, since it uses less digits than its factorization.

42661993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228167.

The product of its digits is 69984, while the sum is 40.

The square root of 42661993 is about 6531.6148845443. The cubic root of 42661993 is about 349.4194266039.

The spelling of 42661993 in words is "forty-two million, six hundred sixty-one thousand, nine hundred ninety-three".