163990 has 24 divisors (see below), whose sum is σ = 318528. Its totient is φ = 60720.

The previous prime is 163987. The next prime is 163991. The reversal of 163990 is 99361.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5275 + ... + 5305.

It is an arithmetic number, because the mean of its divisors is an integer number (13272).

2¹⁶³⁹⁹⁰ is an apocalyptic number.

163990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163990 is a deficient number, since it is larger than the sum of its proper divisors (154538).

163990 is a wasteful number, since it uses less digits than its factorization.

163990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 163990 is about 404.9567878182. The cubic root of 163990 is about 54.7359241840.

The spelling of 163990 in words is "one hundred sixty-three thousand, nine hundred ninety".