84821798 has 4 divisors (see below), whose sum is σ = 127232700. Its totient is φ = 42410898.

The previous prime is 84821791. The next prime is 84821819. The reversal of 84821798 is 89712848.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84821791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21205448 + ... + 21205451.

It is an arithmetic number, because the mean of its divisors is an integer number (31808175).

Almost surely, 2^84821798 is an apocalyptic number.

84821798 is a deficient number, since it is larger than the sum of its proper divisors (42410902).

84821798 is a wasteful number, since it uses less digits than its factorization.

84821798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42410901.

The product of its digits is 258048, while the sum is 47.

The square root of 84821798 is about 9209.8750262965. The cubic root of 84821798 is about 439.3754879880.

The spelling of 84821798 in words is "eighty-four million, eight hundred twenty-one thousand, seven hundred ninety-eight".