99139212 has 18 divisors (see below), whose sum is σ = 250601988. Its totient is φ = 33046392.

The previous prime is 99139211. The next prime is 99139231. The reversal of 99139212 is 21293199.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2753867 = 99139212 / (9 + 9 + 1 + 3 + 9 + 2 + 1 + 2).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (99139211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1376898 + ... + 1376969.

Almost surely, 2^99139212 is an apocalyptic number.

It is an amenable number.

99139212 is an abundant number, since it is smaller than the sum of its proper divisors (151462776).

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

99139212 is a wasteful number, since it uses less digits than its factorization.

99139212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2753877 (or 2753872 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 99139212 is about 9956.8675797160. The cubic root of 99139212 is about 462.8232356440.

The spelling of 99139212 in words is "ninety-nine million, one hundred thirty-nine thousand, two hundred twelve".