86821938 has 24 divisors (see below), whose sum is σ = 214987968. Its totient is φ = 24806232.

The previous prime is 86821921. The next prime is 86821949. The reversal of 86821938 is 83912868.

It is a junction number, because it is equal to n+sod(n) for n = 86821893 and 86821902.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344406 + ... + 344657.

It is an arithmetic number, because the mean of its divisors is an integer number (8957832).

Almost surely, 2^86821938 is an apocalyptic number.

86821938 is an abundant number, since it is smaller than the sum of its proper divisors (128166030).

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

86821938 is a wasteful number, since it uses less digits than its factorization.

86821938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689078 (or 689075 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 86821938 is about 9317.8290389983. The cubic root of 86821938 is about 442.8022563860.

The spelling of 86821938 in words is "eighty-six million, eight hundred twenty-one thousand, nine hundred thirty-eight".