138898287 has 16 divisors (see below), whose sum is σ = 224482560. Its totient is φ = 84180600.

The previous prime is 138898273. The next prime is 138898297. The reversal of 138898287 is 782898831.

It is not a de Polignac number, because 138898287 - 2⁴ = 138898271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138898297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233539 + ... + 234132.

It is an arithmetic number, because the mean of its divisors is an integer number (14030160).

Almost surely, 2^138898287 is an apocalyptic number.

138898287 is a deficient number, since it is larger than the sum of its proper divisors (85584273).

138898287 is a wasteful number, since it uses less digits than its factorization.

138898287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467691 (or 467685 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 138898287 is about 11785.5117411167. The cubic root of 138898287 is about 517.8837649087.

The spelling of 138898287 in words is "one hundred thirty-eight million, eight hundred ninety-eight thousand, two hundred eighty-seven".