212399992 has 16 divisors (see below), whose sum is σ = 455142960. Its totient is φ = 91028544.

The previous prime is 212399981. The next prime is 212400037. The reversal of 212399992 is 299993212.

It is a super-2 number, since 2×212399992² = 90227513203200128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1896373 + ... + 1896484.

It is an arithmetic number, because the mean of its divisors is an integer number (28446435).

Almost surely, 2^212399992 is an apocalyptic number.

It is an amenable number.

212399992 is an abundant number, since it is smaller than the sum of its proper divisors (242742968).

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

212399992 is a wasteful number, since it uses less digits than its factorization.

212399992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3792870 (or 3792866 counting only the distinct ones).

The product of its digits is 157464, while the sum is 46.

The square root of 212399992 is about 14573.9490873270. The cubic root of 212399992 is about 596.6479672607.

The spelling of 212399992 in words is "two hundred twelve million, three hundred ninety-nine thousand, nine hundred ninety-two".