212449978 has 8 divisors (see below), whose sum is σ = 343188468. Its totient is φ = 98053824.

The previous prime is 212449957. The next prime is 212449999. The reversal of 212449978 is 879944212.

It is an interprime number because it is at equal distance from previous prime (212449957) and next prime (212449999).

It can be written as a sum of positive squares in 2 ways, for example, as 208889209 + 3560769 = 14453^2 + 1887^2 .

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

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, 4085551 + ... + 4085602.

Almost surely, 2^212449978 is an apocalyptic number.

212449978 is a deficient number, since it is larger than the sum of its proper divisors (130738490).

212449978 is a wasteful number, since it uses less digits than its factorization.

212449978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8171168.

The product of its digits is 290304, while the sum is 46.

The square root of 212449978 is about 14575.6638956858. The cubic root of 212449978 is about 596.6947684332.

The spelling of 212449978 in words is "two hundred twelve million, four hundred forty-nine thousand, nine hundred seventy-eight".