138890493 has 48 divisors (see below), whose sum is σ = 248766336. Its totient is φ = 72852480.

The previous prime is 138890461. The next prime is 138890501. The reversal of 138890493 is 394098831.

It is not a de Polignac number, because 138890493 - 2⁵ = 138890461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138890443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42330 + ... + 45492.

It is an arithmetic number, because the mean of its divisors is an integer number (5182632).

Almost surely, 2^138890493 is an apocalyptic number.

It is an amenable number.

138890493 is a deficient number, since it is larger than the sum of its proper divisors (109875843).

138890493 is a wasteful number, since it uses less digits than its factorization.

138890493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234 (or 3231 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 138890493 is about 11785.1810762500. The cubic root of 138890493 is about 517.8740780564.

The spelling of 138890493 in words is "one hundred thirty-eight million, eight hundred ninety thousand, four hundred ninety-three".