138917646 has 48 divisors (see below), whose sum is σ = 359113680. Its totient is φ = 39690000.

The previous prime is 138917641. The next prime is 138917651. The reversal of 138917646 is 646719831.

It is a happy number.

138917646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138917641) and next prime (138917651).

It is a super-2 number, since 2×138917646² = 38596224740362632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138917641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23605 + ... + 28896.

It is an arithmetic number, because the mean of its divisors is an integer number (7481535).

Almost surely, 2^138917646 is an apocalyptic number.

138917646 is an abundant number, since it is smaller than the sum of its proper divisors (220196034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138917646 is a wasteful number, since it uses less digits than its factorization.

138917646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52526 (or 52513 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 138917646 is about 11786.3330175250. Note that the first 3 decimals coincide. The cubic root of 138917646 is about 517.9078238713.

The spelling of 138917646 in words is "one hundred thirty-eight million, nine hundred seventeen thousand, six hundred forty-six".