137806809 has 16 divisors (see below), whose sum is σ = 212524032. Its totient is φ = 77797008.

The previous prime is 137806789. The next prime is 137806871. The reversal of 137806809 is 908608731.

137806809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 137806809 - 2¹⁹ = 137282521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137806609) 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, 37789 + ... + 41274.

It is an arithmetic number, because the mean of its divisors is an integer number (13282752).

Almost surely, 2^137806809 is an apocalyptic number.

It is an amenable number.

137806809 is a deficient number, since it is larger than the sum of its proper divisors (74717223).

137806809 is an equidigital number, since it uses as much as digits as its factorization.

137806809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79156.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 137806809 is about 11739.1144896027. The cubic root of 137806809 is about 516.5236668882.

The spelling of 137806809 in words is "one hundred thirty-seven million, eight hundred six thousand, eight hundred nine".