136409 has 8 divisors (see below), whose sum is σ = 168000. Its totient is φ = 107856.

The previous prime is 136403. The next prime is 136417. The reversal of 136409 is 904631.

136409 is nontrivially palindromic in base 11.

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

It is not a de Polignac number, because 136409 - 2⁴ = 136393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136403) 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, 659 + ... + 840.

It is an arithmetic number, because the mean of its divisors is an integer number (21000).

2¹³⁶⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

136409 is a deficient number, since it is larger than the sum of its proper divisors (31591).

136409 is a wasteful number, since it uses less digits than its factorization.

136409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 136409 is about 369.3358904845. The cubic root of 136409 is about 51.4771318963.

It can be divided in two parts, 13640 and 9, that multiplied together give a triangular number (122760 = T₄₉₅).

The spelling of 136409 in words is "one hundred thirty-six thousand, four hundred nine".