137729923 has 4 divisors (see below), whose sum is σ = 137805408. Its totient is φ = 137654440.

The previous prime is 137729897. The next prime is 137729941. The reversal of 137729923 is 329927731.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137729923 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 137729923.

It is not an unprimeable number, because it can be changed into a prime (137729953) 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 3 ways as a sum of consecutive naturals, for example, 34936 + ... + 38677.

It is an arithmetic number, because the mean of its divisors is an integer number (34451352).

Almost surely, 2^137729923 is an apocalyptic number.

137729923 is a deficient number, since it is larger than the sum of its proper divisors (75485).

137729923 is an equidigital number, since it uses as much as digits as its factorization.

137729923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75484.

The product of its digits is 142884, while the sum is 43.

The square root of 137729923 is about 11735.8392541820. The cubic root of 137729923 is about 516.4275883588.

The spelling of 137729923 in words is "one hundred thirty-seven million, seven hundred twenty-nine thousand, nine hundred twenty-three".