4081978 has 4 divisors (see below), whose sum is σ = 6122970. Its totient is φ = 2040988.

The previous prime is 4081969. The next prime is 4081991. The reversal of 4081978 is 8791804.

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., 4068289 + 13689 = 2017^2 + 117^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020493 + ... + 1020496.

Almost surely, 2^4081978 is an apocalyptic number.

4081978 is a deficient number, since it is larger than the sum of its proper divisors (2040992).

4081978 is a wasteful number, since it uses less digits than its factorization.

4081978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040991.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 4081978 is about 2020.3905563034. The cubic root of 4081978 is about 159.8172131355.

The spelling of 4081978 in words is "four million, eighty-one thousand, nine hundred seventy-eight".