2978818 has 4 divisors (see below), whose sum is σ = 4468230. Its totient is φ = 1489408.

The previous prime is 2978797. The next prime is 2978819. The reversal of 2978818 is 8188792.

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., 2411809 + 567009 = 1553^2 + 753^2 .

It is not an unprimeable number, because it can be changed into a prime (2978819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 744703 + ... + 744706.

2^2978818 is an apocalyptic number.

2978818 is a deficient number, since it is larger than the sum of its proper divisors (1489412).

2978818 is a wasteful number, since it uses less digits than its factorization.

2978818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489411.

The product of its digits is 64512, while the sum is 43.

The square root of 2978818 is about 1725.9252591002. The cubic root of 2978818 is about 143.8847135390.

The spelling of 2978818 in words is "two million, nine hundred seventy-eight thousand, eight hundred eighteen".