9780138858 has 32 divisors (see below), whose sum is σ = 22575945600. Its totient is φ = 2766657600.

The previous prime is 9780138857. The next prime is 9780138871. The reversal of 9780138858 is 8588310879.

It is a super-2 number, since 2×9780138858² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9780138798 and 9780138807.

It is not an unprimeable number, because it can be changed into a prime (9780138857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1148533 + ... + 1157016.

It is an arithmetic number, because the mean of its divisors is an integer number (705498300).

Almost surely, 2^9780138858 is an apocalyptic number.

9780138858 is an abundant number, since it is smaller than the sum of its proper divisors (12795806742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9780138858 is a wasteful number, since it uses less digits than its factorization.

9780138858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305662.

The product of its (nonzero) digits is 3870720, while the sum is 57.

The square root of 9780138858 is about 98894.5845736762. The cubic root of 9780138858 is about 2138.5283253693.

The spelling of 9780138858 in words is "nine billion, seven hundred eighty million, one hundred thirty-eight thousand, eight hundred fifty-eight".