138727406 has 4 divisors (see below), whose sum is σ = 208091112. Its totient is φ = 69363702.

The previous prime is 138727403. The next prime is 138727411. The reversal of 138727406 is 604727831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604727831 = 61 ⋅9913571.

It is a self number, because there is not a number n which added to its sum of digits gives 138727406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138727403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34681850 + ... + 34681853.

It is an arithmetic number, because the mean of its divisors is an integer number (52022778).

Almost surely, 2^138727406 is an apocalyptic number.

138727406 is a deficient number, since it is larger than the sum of its proper divisors (69363706).

138727406 is an equidigital number, since it uses as much as digits as its factorization.

138727406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69363705.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 138727406 is about 11778.2598884555. The cubic root of 138727406 is about 517.6713005374.

The spelling of 138727406 in words is "one hundred thirty-eight million, seven hundred twenty-seven thousand, four hundred six".