84821740 has 24 divisors (see below), whose sum is σ = 178354512. Its totient is φ = 33885120.

The previous prime is 84821731. The next prime is 84821749. The reversal of 84821740 is 4712848.

It is an interprime number because it is at equal distance from previous prime (84821731) and next prime (84821749).

It is a junction number, because it is equal to n+sod(n) for n = 84821696 and 84821705.

It is not an unprimeable number, because it can be changed into a prime (84821749) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16567 + ... + 21073.

It is an arithmetic number, because the mean of its divisors is an integer number (7431438).

Almost surely, 2^84821740 is an apocalyptic number.

It is an amenable number.

84821740 is an abundant number, since it is smaller than the sum of its proper divisors (93532772).

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

84821740 is a wasteful number, since it uses less digits than its factorization.

84821740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5457 (or 5455 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 84821740 is about 9209.8718775019. The cubic root of 84821740 is about 439.3753878416.

The spelling of 84821740 in words is "eighty-four million, eight hundred twenty-one thousand, seven hundred forty".