138897249 has 8 divisors (see below), whose sum is σ = 185851872. Its totient is φ = 92270400.

The previous prime is 138897197. The next prime is 138897257. The reversal of 138897249 is 942798831.

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

It is not a de Polignac number, because 138897249 - 2⁸ = 138896993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138897749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80952 + ... + 82649.

It is an arithmetic number, because the mean of its divisors is an integer number (23231484).

Almost surely, 2^138897249 is an apocalyptic number.

It is an amenable number.

138897249 is a deficient number, since it is larger than the sum of its proper divisors (46954623).

138897249 is a wasteful number, since it uses less digits than its factorization.

138897249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163887.

The product of its digits is 870912, while the sum is 51.

The square root of 138897249 is about 11785.4677039140. The cubic root of 138897249 is about 517.8824748408.

The spelling of 138897249 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, two hundred forty-nine".