138001249 has 4 divisors (see below), whose sum is σ = 139367700. Its totient is φ = 136634800.

The previous prime is 138001247. The next prime is 138001261. The reversal of 138001249 is 942100831.

It is a happy number.

138001249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56731024 + 81270225 = 7532^2 + 9015^2 .

It is a cyclic number.

It is not a de Polignac number, because 138001249 - 2¹ = 138001247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138001247) 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, 683074 + ... + 683275.

It is an arithmetic number, because the mean of its divisors is an integer number (34841925).

Almost surely, 2^138001249 is an apocalyptic number.

It is an amenable number.

138001249 is a deficient number, since it is larger than the sum of its proper divisors (1366451).

138001249 is a wasteful number, since it uses less digits than its factorization.

138001249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366450.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 138001249 is about 11747.3932853208. The cubic root of 138001249 is about 516.7664842640.

The spelling of 138001249 in words is "one hundred thirty-eight million, one thousand, two hundred forty-nine".