137388689 has 4 divisors (see below), whose sum is σ = 142126260. Its totient is φ = 132651120.

The previous prime is 137388673. The next prime is 137388707. The reversal of 137388689 is 986883731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60528400 + 76860289 = 7780^2 + 8767^2 .

It is a cyclic number.

It is not a de Polignac number, because 137388689 - 2⁴ = 137388673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137388689.

It is not an unprimeable number, because it can be changed into a prime (137388649) 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, 2368742 + ... + 2368799.

It is an arithmetic number, because the mean of its divisors is an integer number (35531565).

Almost surely, 2^137388689 is an apocalyptic number.

It is an amenable number.

137388689 is a deficient number, since it is larger than the sum of its proper divisors (4737571).

137388689 is an equidigital number, since it uses as much as digits as its factorization.

137388689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4737570.

The product of its digits is 1741824, while the sum is 53.

The square root of 137388689 is about 11721.2921216050. The cubic root of 137388689 is about 516.0007423922. Note that the first 3 decimals are identical.

The spelling of 137388689 in words is "one hundred thirty-seven million, three hundred eighty-eight thousand, six hundred eighty-nine".