97821818 has 16 divisors (see below), whose sum is σ = 153812736. Its totient is φ = 46606560.

The previous prime is 97821817. The next prime is 97821839. The reversal of 97821818 is 81812879.

It is not an unprimeable number, because it can be changed into a prime (97821817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10346 + ... + 17397.

It is an arithmetic number, because the mean of its divisors is an integer number (9613296).

Almost surely, 2^97821818 is an apocalyptic number.

97821818 is a deficient number, since it is larger than the sum of its proper divisors (55990918).

97821818 is a wasteful number, since it uses less digits than its factorization.

97821818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27829.

The product of its digits is 64512, while the sum is 44.

The square root of 97821818 is about 9890.4912921452. The cubic root of 97821818 is about 460.7640390221.

The spelling of 97821818 in words is "ninety-seven million, eight hundred twenty-one thousand, eight hundred eighteen".