309340240187 has 16 divisors (see below), whose sum is σ = 363887233920. Its totient is φ = 259919438400.

The previous prime is 309340240141. The next prime is 309340240213. The reversal of 309340240187 is 781042043903.

It is a cyclic number.

It is not a de Polignac number, because 309340240187 - 2¹⁸ = 309339978043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (309340240117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18041393 + ... + 18058530.

It is an arithmetic number, because the mean of its divisors is an integer number (22742952120).

Almost surely, 2^309340240187 is an apocalyptic number.

309340240187 is a deficient number, since it is larger than the sum of its proper divisors (54546993733).

309340240187 is a wasteful number, since it uses less digits than its factorization.

309340240187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36099994.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 309340240187 in words is "three hundred nine billion, three hundred forty million, two hundred forty thousand, one hundred eighty-seven".