139623289 has 8 divisors (see below), whose sum is σ = 152054280. Its totient is φ = 127433856.

The previous prime is 139623277. The next prime is 139623299. The reversal of 139623289 is 982326931.

It can be written as a sum of positive squares in 4 ways, for example, as 15077689 + 124545600 = 3883^2 + 11160^2 .

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 139623289 - 2¹⁹ = 139099001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139623259) 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, 59182 + ... + 61495.

It is an arithmetic number, because the mean of its divisors is an integer number (19006785).

Almost surely, 2^139623289 is an apocalyptic number.

It is an amenable number.

139623289 is a deficient number, since it is larger than the sum of its proper divisors (12430991).

139623289 is a wasteful number, since it uses less digits than its factorization.

139623289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120779.

The product of its digits is 139968, while the sum is 43.

The square root of 139623289 is about 11816.2298978989. The cubic root of 139623289 is about 518.7832609631.

The spelling of 139623289 in words is "one hundred thirty-nine million, six hundred twenty-three thousand, two hundred eighty-nine".