138955293 has 6 divisors (see below), whose sum is σ = 200713214. Its totient is φ = 92636856.

The previous prime is 138955283. The next prime is 138955301. The reversal of 138955293 is 392559831.

138955293 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 552 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 89927289 + 49028004 = 9483^2 + 7002^2 .

It is not a de Polignac number, because 138955293 - 2¹⁶ = 138889757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138955283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7719730 + ... + 7719747.

Almost surely, 2^138955293 is an apocalyptic number.

It is an amenable number.

138955293 is a deficient number, since it is larger than the sum of its proper divisors (61757921).

138955293 is a wasteful number, since it uses less digits than its factorization.

138955293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15439483 (or 15439480 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 138955293 is about 11787.9299709491. The cubic root of 138955293 is about 517.9546043809.

The spelling of 138955293 in words is "one hundred thirty-eight million, nine hundred fifty-five thousand, two hundred ninety-three".