212797978 has 8 divisors (see below), whose sum is σ = 333075168. Its totient is φ = 101772924.

The previous prime is 212797961. The next prime is 212797997. The reversal of 212797978 is 879797212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2312976 + ... + 2313067.

It is an arithmetic number, because the mean of its divisors is an integer number (41634396).

Almost surely, 2^212797978 is an apocalyptic number.

212797978 is a deficient number, since it is larger than the sum of its proper divisors (120277190).

212797978 is a wasteful number, since it uses less digits than its factorization.

212797978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626068.

The product of its digits is 889056, while the sum is 52.

The square root of 212797978 is about 14587.5967177599. The cubic root of 212797978 is about 597.0203925408.

The spelling of 212797978 in words is "two hundred twelve million, seven hundred ninety-seven thousand, nine hundred seventy-eight".