212977990 has 16 divisors (see below), whose sum is σ = 388761120. Its totient is φ = 83991040.

The previous prime is 212977987. The next prime is 212977991. The reversal of 212977990 is 99779212.

It is a self number, because there is not a number n which added to its sum of digits gives 212977990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212977991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149275 + ... + 150694.

It is an arithmetic number, because the mean of its divisors is an integer number (24297570).

Almost surely, 2^212977990 is an apocalyptic number.

212977990 is a deficient number, since it is larger than the sum of its proper divisors (175783130).

212977990 is a wasteful number, since it uses less digits than its factorization.

212977990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300047.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 212977990 is about 14593.7654496706. The cubic root of 212977990 is about 597.1886907328.

The spelling of 212977990 in words is "two hundred twelve million, nine hundred seventy-seven thousand, nine hundred ninety".