138616646 has 8 divisors (see below), whose sum is σ = 237628560. Its totient is φ = 59407128.

The previous prime is 138616633. The next prime is 138616651. The reversal of 138616646 is 646616831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4950581 + ... + 4950608.

It is an arithmetic number, because the mean of its divisors is an integer number (29703570).

Almost surely, 2^138616646 is an apocalyptic number.

138616646 is a deficient number, since it is larger than the sum of its proper divisors (99011914).

138616646 is an equidigital number, since it uses as much as digits as its factorization.

138616646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901198.

The product of its digits is 124416, while the sum is 41.

The square root of 138616646 is about 11773.5570665793. The cubic root of 138616646 is about 517.5334942186.

The spelling of 138616646 in words is "one hundred thirty-eight million, six hundred sixteen thousand, six hundred forty-six".