138986461 has 4 divisors (see below), whose sum is σ = 139754524. Its totient is φ = 138218400.

The previous prime is 138986459. The next prime is 138986483. The reversal of 138986461 is 164689831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29365561 + 109620900 = 5419^2 + 10470^2 .

It is a cyclic number.

It is not a de Polignac number, because 138986461 - 2¹ = 138986459 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 (138986261) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 383760 + ... + 384121.

It is an arithmetic number, because the mean of its divisors is an integer number (34938631).

Almost surely, 2^138986461 is an apocalyptic number.

It is an amenable number.

138986461 is a deficient number, since it is larger than the sum of its proper divisors (768063).

138986461 is an equidigital number, since it uses as much as digits as its factorization.

138986461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768062.

The product of its digits is 248832, while the sum is 46.

The square root of 138986461 is about 11789.2519270732. The cubic root of 138986461 is about 517.9933276323.

The spelling of 138986461 in words is "one hundred thirty-eight million, nine hundred eighty-six thousand, four hundred sixty-one".