99940212 has 72 divisors (see below), whose sum is σ = 271272456. Its totient is φ = 30910464.

The previous prime is 99940201. The next prime is 99940223. The reversal of 99940212 is 21204999.

It is an interprime number because it is at equal distance from previous prime (99940201) and next prime (99940223).

It can be written as a sum of positive squares in 4 ways, for example, as 44675856 + 55264356 = 6684^2 + 7434^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43558 + ... + 45794.

It is an arithmetic number, because the mean of its divisors is an integer number (3767673).

Almost surely, 2^99940212 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 99940212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135636228).

99940212 is an abundant number, since it is smaller than the sum of its proper divisors (171332244).

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

99940212 is a wasteful number, since it uses less digits than its factorization.

99940212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337 (or 2332 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 99940212 is about 9997.0101530408. The cubic root of 99940212 is about 464.0663611487.

The spelling of 99940212 in words is "ninety-nine million, nine hundred forty thousand, two hundred twelve".