138446513 has 4 divisors (see below), whose sum is σ = 138485760. Its totient is φ = 138407268.

The previous prime is 138446491. The next prime is 138446519. The reversal of 138446513 is 315644831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315644831 = 17 ⋅18567343.

It is a cyclic number.

It is not a de Polignac number, because 138446513 - 2⁶ = 138446449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138446519) 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, 13745 + ... + 21582.

It is an arithmetic number, because the mean of its divisors is an integer number (34621440).

Almost surely, 2^138446513 is an apocalyptic number.

It is an amenable number.

138446513 is a deficient number, since it is larger than the sum of its proper divisors (39247).

138446513 is an equidigital number, since it uses as much as digits as its factorization.

138446513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39246.

The product of its digits is 34560, while the sum is 35.

The square root of 138446513 is about 11766.3296316226. The cubic root of 138446513 is about 517.3216736424.

The spelling of 138446513 in words is "one hundred thirty-eight million, four hundred forty-six thousand, five hundred thirteen".