138607477 has 4 divisors (see below), whose sum is σ = 146760876. Its totient is φ = 130454080.

The previous prime is 138607463. The next prime is 138607481. The reversal of 138607477 is 774706831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 774706831 = 641 ⋅1208591.

It can be written as a sum of positive squares in 2 ways, for example, as 82192356 + 56415121 = 9066^2 + 7511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138607477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138607577) 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, 4076674 + ... + 4076707.

It is an arithmetic number, because the mean of its divisors is an integer number (36690219).

Almost surely, 2^138607477 is an apocalyptic number.

138607477 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138607477 is a deficient number, since it is larger than the sum of its proper divisors (8153399).

138607477 is an equidigital number, since it uses as much as digits as its factorization.

138607477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8153398.

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 138607477 is about 11773.1676705974. The cubic root of 138607477 is about 517.5220829647.

It can be divided in two parts, 138 and 607477, that multiplied together give a triangular number (83831826 = T₁₂₉₄₈).

The spelling of 138607477 in words is "one hundred thirty-eight million, six hundred seven thousand, four hundred seventy-seven".