212399990 has 32 divisors (see below), whose sum is σ = 418611456. Its totient is φ = 76952160.

The previous prime is 212399981. The next prime is 212400037. The reversal of 212399990 is 99993212.

It is a super-2 number, since 2×212399990² = 90227511504000200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27719 + ... + 34541.

It is an arithmetic number, because the mean of its divisors is an integer number (13081608).

Almost surely, 2^212399990 is an apocalyptic number.

212399990 is a deficient number, since it is larger than the sum of its proper divisors (206211466).

212399990 is a wasteful number, since it uses less digits than its factorization.

212399990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 212399990 is about 14573.9490187114. The cubic root of 212399990 is about 596.6479653880.

The spelling of 212399990 in words is "two hundred twelve million, three hundred ninety-nine thousand, nine hundred ninety".