138458507 has 8 divisors (see below), whose sum is σ = 151606272. Its totient is φ = 125404200.

The previous prime is 138458501. The next prime is 138458513. The reversal of 138458507 is 705854831.

It is an interprime number because it is at equal distance from previous prime (138458501) and next prime (138458513).

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 138458507 - 2²⁶ = 71349643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138458501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20243 + ... + 26204.

It is an arithmetic number, because the mean of its divisors is an integer number (18950784).

Almost surely, 2^138458507 is an apocalyptic number.

138458507 is a deficient number, since it is larger than the sum of its proper divisors (13147765).

138458507 is a wasteful number, since it uses less digits than its factorization.

138458507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46729.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 138458507 is about 11766.8392952398. The cubic root of 138458507 is about 517.3366122081.

The spelling of 138458507 in words is "one hundred thirty-eight million, four hundred fifty-eight thousand, five hundred seven".