138578582 has 4 divisors (see below), whose sum is σ = 207867876. Its totient is φ = 69289290.

The previous prime is 138578549. The next prime is 138578593. The reversal of 138578582 is 285875831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 285875831 = 31 ⋅9221801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34644644 + ... + 34644647.

It is an arithmetic number, because the mean of its divisors is an integer number (51966969).

Almost surely, 2^138578582 is an apocalyptic number.

138578582 is a deficient number, since it is larger than the sum of its proper divisors (69289294).

138578582 is an equidigital number, since it uses as much as digits as its factorization.

138578582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69289293.

The product of its digits is 537600, while the sum is 47.

The square root of 138578582 is about 11771.9404517692. The cubic root of 138578582 is about 517.4861184791.

The spelling of 138578582 in words is "one hundred thirty-eight million, five hundred seventy-eight thousand, five hundred eighty-two".