153640709 has 4 divisors (see below), whose sum is σ = 153775116. Its totient is φ = 153506304.

The previous prime is 153640699. The next prime is 153640717. The reversal of 153640709 is 907046351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 907046351 = 4013 ⋅226027.

It can be written as a sum of positive squares in 2 ways, for example, as 133864900 + 19775809 = 11570^2 + 4447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-153640709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153640769) 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, 65474 + ... + 67779.

It is an arithmetic number, because the mean of its divisors is an integer number (38443779).

Almost surely, 2^153640709 is an apocalyptic number.

It is an amenable number.

153640709 is a deficient number, since it is larger than the sum of its proper divisors (134407).

153640709 is a wasteful number, since it uses less digits than its factorization.

153640709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134406.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 153640709 is about 12395.1889457160. The cubic root of 153640709 is about 535.5936682928.

The spelling of 153640709 in words is "one hundred fifty-three million, six hundred forty thousand, seven hundred nine".