136440289 has 4 divisors (see below), whose sum is σ = 137765056. Its totient is φ = 135115524.

The previous prime is 136440281. The next prime is 136440313. The reversal of 136440289 is 982044631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982044631 = 1823 ⋅538697.

It is a cyclic number.

It is not a de Polignac number, because 136440289 - 2³ = 136440281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136440281) 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, 662229 + ... + 662434.

It is an arithmetic number, because the mean of its divisors is an integer number (34441264).

Almost surely, 2^136440289 is an apocalyptic number.

It is an amenable number.

136440289 is a deficient number, since it is larger than the sum of its proper divisors (1324767).

136440289 is a wasteful number, since it uses less digits than its factorization.

136440289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324766.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 136440289 is about 11680.7657711299. The cubic root of 136440289 is about 514.8106747450.

The spelling of 136440289 in words is "one hundred thirty-six million, four hundred forty thousand, two hundred eighty-nine".