99212840 has 64 divisors (see below), whose sum is σ = 230409360. Its totient is φ = 38430720.

The previous prime is 99212837. The next prime is 99212879. The reversal of 99212840 is 4821299.

It can be written as a sum of positive squares in 8 ways, for example, as 4072324 + 95140516 = 2018^2 + 9754^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 99212840.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177842 + ... + 178398.

Almost surely, 2^99212840 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 99212840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115204680).

99212840 is an abundant number, since it is smaller than the sum of its proper divisors (131196520).

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

99212840 is a wasteful number, since it uses less digits than its factorization.

99212840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 99212840 is about 9960.5642410458. The cubic root of 99212840 is about 462.9377827071.

The spelling of 99212840 in words is "ninety-nine million, two hundred twelve thousand, eight hundred forty".