84391980 has 24 divisors (see below), whose sum is σ = 236297712. Its totient is φ = 22504512.

The previous prime is 84391963. The next prime is 84391997. The reversal of 84391980 is 8919348.

It is an interprime number because it is at equal distance from previous prime (84391963) and next prime (84391997).

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, 703207 + ... + 703326.

It is an arithmetic number, because the mean of its divisors is an integer number (9845738).

Almost surely, 2^84391980 is an apocalyptic number.

It is an amenable number.

84391980 is an abundant number, since it is smaller than the sum of its proper divisors (151905732).

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

84391980 is a wasteful number, since it uses less digits than its factorization.

84391980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406545 (or 1406543 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 84391980 is about 9186.5107630699. The cubic root of 84391980 is about 438.6320808747.

The spelling of 84391980 in words is "eighty-four million, three hundred ninety-one thousand, nine hundred eighty".