163690 has 8 divisors (see below), whose sum is σ = 294660. Its totient is φ = 65472.

The previous prime is 163679. The next prime is 163697. The reversal of 163690 is 96361.

It can be written as a sum of positive squares in 2 ways, for example, as 159201 + 4489 = 399^2 + 67^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×163690² = 53588832200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (163697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8175 + ... + 8194.

2¹⁶³⁶⁹⁰ is an apocalyptic number.

163690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163690 is a deficient number, since it is larger than the sum of its proper divisors (130970).

163690 is a wasteful number, since it uses less digits than its factorization.

163690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16376.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 163690 is about 404.5862083660. The cubic root of 163690 is about 54.7025262111.

The spelling of 163690 in words is "one hundred sixty-three thousand, six hundred ninety".