163442993 has 8 divisors (see below), whose sum is σ = 188506560. Its totient is φ = 138808080.

The previous prime is 163442989. The next prime is 163442999. The reversal of 163442993 is 399244361.

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 163442993 - 2² = 163442989 is a prime.

It is a super-2 number, since 2×163442993² = 53427223921596098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163442993.

It is not an unprimeable number, because it can be changed into a prime (163442999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106343 + ... + 107868.

It is an arithmetic number, because the mean of its divisors is an integer number (23563320).

Almost surely, 2^163442993 is an apocalyptic number.

It is an amenable number.

163442993 is a deficient number, since it is larger than the sum of its proper divisors (25063567).

163442993 is a wasteful number, since it uses less digits than its factorization.

163442993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214327.

The product of its digits is 139968, while the sum is 41.

The square root of 163442993 is about 12784.4825081033. The cubic root of 163442993 is about 546.7499712347.

The spelling of 163442993 in words is "one hundred sixty-three million, four hundred forty-two thousand, nine hundred ninety-three".