138498649 has 4 divisors (see below), whose sum is σ = 139380964. Its totient is φ = 137616336.

The previous prime is 138498631. The next prime is 138498667. The reversal of 138498649 is 946894831.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (138498631) and next prime (138498667).

It can be written as a sum of positive squares in 2 ways, for example, as 93702400 + 44796249 = 9680^2 + 6693^2 .

It is a cyclic number.

It is not a de Polignac number, because 138498649 - 2¹¹ = 138496601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138498596 and 138498605.

It is not an unprimeable number, because it can be changed into a prime (138498749) 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, 440922 + ... + 441235.

It is an arithmetic number, because the mean of its divisors is an integer number (34845241).

Almost surely, 2^138498649 is an apocalyptic number.

It is an amenable number.

138498649 is a deficient number, since it is larger than the sum of its proper divisors (882315).

138498649 is an equidigital number, since it uses as much as digits as its factorization.

138498649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882314.

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

The square root of 138498649 is about 11768.5448973099. The cubic root of 138498649 is about 517.3866029241.

The spelling of 138498649 in words is "one hundred thirty-eight million, four hundred ninety-eight thousand, six hundred forty-nine".