137820009 has 8 divisors (see below), whose sum is σ = 183814912. Its totient is φ = 91852560.

The previous prime is 137819999. The next prime is 137820041. The reversal of 137820009 is 900028731.

It is a happy number.

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

It is not a de Polignac number, because 137820009 - 2⁷ = 137819881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137800009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13407 + ... + 21339.

It is an arithmetic number, because the mean of its divisors is an integer number (22976864).

Almost surely, 2^137820009 is an apocalyptic number.

It is an amenable number.

137820009 is a deficient number, since it is larger than the sum of its proper divisors (45994903).

137820009 is an equidigital number, since it uses as much as digits as its factorization.

137820009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13727.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 137820009 is about 11739.6766991259. The cubic root of 137820009 is about 516.5401583199.

The spelling of 137820009 in words is "one hundred thirty-seven million, eight hundred twenty thousand, nine".