4027978 has 4 divisors (see below), whose sum is σ = 6041970. Its totient is φ = 2013988.

The previous prime is 4027957. The next prime is 4027993. The reversal of 4027978 is 8797204.

It is a happy number.

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., 3790809 + 237169 = 1947^2 + 487^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1006993 + ... + 1006996.

Almost surely, 2^4027978 is an apocalyptic number.

4027978 is a deficient number, since it is larger than the sum of its proper divisors (2013992).

4027978 is a wasteful number, since it uses less digits than its factorization.

4027978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013991.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 4027978 is about 2006.9823118304. The cubic root of 4027978 is about 159.1093481955.

It can be divided in two parts, 4027 and 978, that added together give a palindrome (5005).

The spelling of 4027978 in words is "four million, twenty-seven thousand, nine hundred seventy-eight".