138428085 has 8 divisors (see below), whose sum is σ = 221484960. Its totient is φ = 73828304.

The previous prime is 138428071. The next prime is 138428111. The reversal of 138428085 is 580824831.

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 138428085 - 2¹⁰ = 138427061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4614255 + ... + 4614284.

It is an arithmetic number, because the mean of its divisors is an integer number (27685620).

Almost surely, 2^138428085 is an apocalyptic number.

138428085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138428085 is a deficient number, since it is larger than the sum of its proper divisors (83056875).

138428085 is an equidigital number, since it uses as much as digits as its factorization.

138428085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9228547.

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 138428085 is about 11765.5465236427. The cubic root of 138428085 is about 517.2987198278.

The spelling of 138428085 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, eighty-five".