86921940 has 96 divisors (see below), whose sum is σ = 279417600. Its totient is φ = 19777536.

The previous prime is 86921851. The next prime is 86921953. The reversal of 86921940 is 4912968.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146284 + ... + 146876.

It is an arithmetic number, because the mean of its divisors is an integer number (2910600).

Almost surely, 2^86921940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86921940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139708800).

86921940 is an abundant number, since it is smaller than the sum of its proper divisors (192495660).

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

86921940 is a wasteful number, since it uses less digits than its factorization.

86921940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 86921940 is about 9323.1936588274. The cubic root of 86921940 is about 442.9721985383.

The spelling of 86921940 in words is "eighty-six million, nine hundred twenty-one thousand, nine hundred forty".