138723337 has 8 divisors (see below), whose sum is σ = 141900480. Its totient is φ = 135573840.

The previous prime is 138723331. The next prime is 138723359. The reversal of 138723337 is 733327831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138723337 - 2¹⁹ = 138199049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138723296 and 138723305.

It is not an unprimeable number, because it can be changed into a prime (138723331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3412 + ... + 17002.

It is an arithmetic number, because the mean of its divisors is an integer number (17737560).

Almost surely, 2^138723337 is an apocalyptic number.

It is an amenable number.

138723337 is a deficient number, since it is larger than the sum of its proper divisors (3177143).

138723337 is a wasteful number, since it uses less digits than its factorization.

138723337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13823.

The product of its digits is 63504, while the sum is 37.

The square root of 138723337 is about 11778.0871536935. The cubic root of 138723337 is about 517.6662392324. Note that the first 3 decimals are identical.

The spelling of 138723337 in words is "one hundred thirty-eight million, seven hundred twenty-three thousand, three hundred thirty-seven".