138407255 has 8 divisors (see below), whose sum is σ = 189815712. Its totient is φ = 94907808.

The previous prime is 138407249. The next prime is 138407257. The reversal of 138407255 is 552704831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138407255 - 2⁸ = 138406999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 3954493 = 138407255 / (1 + 3 + 8 + 4 + 0 + 7 + 2 + 5 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138407257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1977212 + ... + 1977281.

It is an arithmetic number, because the mean of its divisors is an integer number (23726964).

Almost surely, 2^138407255 is an apocalyptic number.

138407255 is a deficient number, since it is larger than the sum of its proper divisors (51408457).

138407255 is an equidigital number, since it uses as much as digits as its factorization.

138407255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954505.

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 138407255 is about 11764.6612785919. The cubic root of 138407255 is about 517.2727716423.

The spelling of 138407255 in words is "one hundred thirty-eight million, four hundred seven thousand, two hundred fifty-five".