137918809 has 8 divisors (see below), whose sum is σ = 163056960. Its totient is φ = 114139536.

The previous prime is 137918801. The next prime is 137918819. The reversal of 137918809 is 908819731.

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

It is not a de Polignac number, because 137918809 - 2³ = 137918801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137918801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339499 + ... + 339904.

It is an arithmetic number, because the mean of its divisors is an integer number (20382120).

Almost surely, 2^137918809 is an apocalyptic number.

It is an amenable number.

137918809 is a deficient number, since it is larger than the sum of its proper divisors (25138151).

137918809 is an equidigital number, since it uses as much as digits as its factorization.

137918809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679439.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 137918809 is about 11743.8838975869. The cubic root of 137918809 is about 516.6635607629.

The spelling of 137918809 in words is "one hundred thirty-seven million, nine hundred eighteen thousand, eight hundred nine".