138866467 has 4 divisors (see below), whose sum is σ = 142253496. Its totient is φ = 135479440.

The previous prime is 138866449. The next prime is 138866473. The reversal of 138866467 is 764668831.

138866467 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 764668831 = 13063 ⋅58537.

It is a cyclic number.

It is not a de Polignac number, because 138866467 - 2¹⁵ = 138833699 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 138866467.

It is not an unprimeable number, because it can be changed into a prime (138866407) 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, 1693453 + ... + 1693534.

It is an arithmetic number, because the mean of its divisors is an integer number (35563374).

Almost surely, 2^138866467 is an apocalyptic number.

138866467 is a deficient number, since it is larger than the sum of its proper divisors (3387029).

138866467 is an equidigital number, since it uses as much as digits as its factorization.

138866467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387028.

The product of its digits is 1161216, while the sum is 49.

The square root of 138866467 is about 11784.1617011988. The cubic root of 138866467 is about 517.8442148171.

The spelling of 138866467 in words is "one hundred thirty-eight million, eight hundred sixty-six thousand, four hundred sixty-seven".