138866465 has 8 divisors (see below), whose sum is σ = 166710528. Its totient is φ = 111046000.

The previous prime is 138866449. The next prime is 138866473. The reversal of 138866465 is 564668831.

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

It is not a de Polignac number, because 138866465 - 2⁴ = 138866449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11984 + ... + 20526.

It is an arithmetic number, because the mean of its divisors is an integer number (20838816).

Almost surely, 2^138866465 is an apocalyptic number.

It is an amenable number.

138866465 is a deficient number, since it is larger than the sum of its proper divisors (27844063).

138866465 is an equidigital number, since it uses as much as digits as its factorization.

138866465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11799.

The product of its digits is 829440, while the sum is 47.

The square root of 138866465 is about 11784.1616163391. The cubic root of 138866465 is about 517.8442123310.

The spelling of 138866465 in words is "one hundred thirty-eight million, eight hundred sixty-six thousand, four hundred sixty-five".