214987978 has 4 divisors (see below), whose sum is σ = 322481970. Its totient is φ = 107493988.

The previous prime is 214987963. The next prime is 214987979. The reversal of 214987978 is 879789412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 203718529 + 11269449 = 14273^2 + 3357^2 .

It is not an unprimeable number, because it can be changed into a prime (214987979) 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 as a sum of consecutive naturals, namely, 53746993 + ... + 53746996.

Almost surely, 2^214987978 is an apocalyptic number.

214987978 is a deficient number, since it is larger than the sum of its proper divisors (107493992).

214987978 is a wasteful number, since it uses less digits than its factorization.

214987978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107493991.

The product of its digits is 2032128, while the sum is 55.

The square root of 214987978 is about 14662.4683460869. The cubic root of 214987978 is about 599.0614753104.

The spelling of 214987978 in words is "two hundred fourteen million, nine hundred eighty-seven thousand, nine hundred seventy-eight".