138684949 has 12 divisors (see below), whose sum is σ = 151998336. Its totient is φ = 126461712.

The previous prime is 138684937. The next prime is 138684961. The reversal of 138684949 is 949486831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138684937) and next prime (138684961).

It is a de Polignac number, because none of the positive numbers 2^k-138684949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138684896 and 138684905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138682949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9084 + ... + 18970.

It is an arithmetic number, because the mean of its divisors is an integer number (12666528).

Almost surely, 2^138684949 is an apocalyptic number.

It is an amenable number.

138684949 is a deficient number, since it is larger than the sum of its proper divisors (13313387).

138684949 is an equidigital number, since it uses as much as digits as its factorization.

138684949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9996 (or 9983 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The square root of 138684949 is about 11776.4574044999. The cubic root of 138684949 is about 517.6184846985.

The spelling of 138684949 in words is "one hundred thirty-eight million, six hundred eighty-four thousand, nine hundred forty-nine".