136540723 has 4 divisors (see below), whose sum is σ = 148953528. Its totient is φ = 124127920.

The previous prime is 136540721. The next prime is 136540741. The reversal of 136540723 is 327045631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136540723 - 2¹ = 136540721 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136540721) 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, 6206386 + ... + 6206407.

It is an arithmetic number, because the mean of its divisors is an integer number (37238382).

Almost surely, 2^136540723 is an apocalyptic number.

136540723 is a deficient number, since it is larger than the sum of its proper divisors (12412805).

136540723 is a wasteful number, since it uses less digits than its factorization.

136540723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12412804.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 136540723 is about 11685.0640990968. The cubic root of 136540723 is about 514.9369615241.

The spelling of 136540723 in words is "one hundred thirty-six million, five hundred forty thousand, seven hundred twenty-three".