2978968394 has 4 divisors (see below), whose sum is σ = 4468452594. Its totient is φ = 1489484196.

The previous prime is 2978968393. The next prime is 2978968411. The reversal of 2978968394 is 4938698792.

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., 1723329169 + 1255639225 = 41513^2 + 35435^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2978968394.

It is not an unprimeable number, because it can be changed into a prime (2978968393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 744742097 + ... + 744742100.

Almost surely, 2^2978968394 is an apocalyptic number.

2978968394 is a deficient number, since it is larger than the sum of its proper divisors (1489484200).

2978968394 is a wasteful number, since it uses less digits than its factorization.

2978968394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489484199.

The product of its digits is 47029248, while the sum is 65.

The square root of 2978968394 is about 54579.9266580672. The cubic root of 2978968394 is about 1438.8713497299.

The spelling of 2978968394 in words is "two billion, nine hundred seventy-eight million, nine hundred sixty-eight thousand, three hundred ninety-four".