138535971 has 8 divisors (see below), whose sum is σ = 211102464. Its totient is φ = 79163400.

The previous prime is 138535963. The next prime is 138535997. The reversal of 138535971 is 179535831.

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

It is not a de Polignac number, because 138535971 - 2³ = 138535963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138535921) 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, 3298455 + ... + 3298496.

It is an arithmetic number, because the mean of its divisors is an integer number (26387808).

Almost surely, 2^138535971 is an apocalyptic number.

138535971 is a deficient number, since it is larger than the sum of its proper divisors (72566493).

138535971 is an equidigital number, since it uses as much as digits as its factorization.

138535971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596961.

The product of its digits is 113400, while the sum is 42.

The square root of 138535971 is about 11770.1304580705. The cubic root of 138535971 is about 517.4330730971.

The spelling of 138535971 in words is "one hundred thirty-eight million, five hundred thirty-five thousand, nine hundred seventy-one".