7212978 has 12 divisors (see below), whose sum is σ = 15628158. Its totient is φ = 2404320.

The previous prime is 7212973. The next prime is 7212979. The reversal of 7212978 is 8792127.

It can be written as a sum of positive squares in only one way, i.e., 6985449 + 227529 = 2643^2 + 477^2 .

It is not an unprimeable number, because it can be changed into a prime (7212971) 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 5 ways as a sum of consecutive naturals, for example, 200343 + ... + 200378.

Almost surely, 2^7212978 is an apocalyptic number.

7212978 is an abundant number, since it is smaller than the sum of its proper divisors (8415180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7212978 is a wasteful number, since it uses less digits than its factorization.

7212978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400729 (or 400726 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 7212978 is about 2685.6987917486. The cubic root of 7212978 is about 193.2138269234.

The spelling of 7212978 in words is "seven million, two hundred twelve thousand, nine hundred seventy-eight".