136643 has 8 divisors (see below), whose sum is σ = 153888. Its totient is φ = 120384.

The previous prime is 136621. The next prime is 136649. The reversal of 136643 is 346631.

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 136643 - 2¹² = 132547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136649) 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, 71 + ... + 527.

It is an arithmetic number, because the mean of its divisors is an integer number (19236).

2¹³⁶⁶⁴³ is an apocalyptic number.

136643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

136643 is a deficient number, since it is larger than the sum of its proper divisors (17245).

136643 is a wasteful number, since it uses less digits than its factorization.

136643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493.

The product of its digits is 1296, while the sum is 23.

The square root of 136643 is about 369.6525395557. The cubic root of 136643 is about 51.5065502084.

The spelling of 136643 in words is "one hundred thirty-six thousand, six hundred forty-three".