4171978 has 4 divisors (see below), whose sum is σ = 6257970. Its totient is φ = 2085988.

The previous prime is 4171967. The next prime is 4171991. The reversal of 4171978 is 8791714.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8791714 = 2 ⋅4395857.

It can be written as a sum of positive squares in only one way, i.e., 3301489 + 870489 = 1817^2 + 933^2 .

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, 1042993 + ... + 1042996.

Almost surely, 2^4171978 is an apocalyptic number.

4171978 is a deficient number, since it is larger than the sum of its proper divisors (2085992).

4171978 is a wasteful number, since it uses less digits than its factorization.

4171978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085991.

The product of its digits is 14112, while the sum is 37.

The square root of 4171978 is about 2042.5420436309. The cubic root of 4171978 is about 160.9832422150.

The spelling of 4171978 in words is "four million, one hundred seventy-one thousand, nine hundred seventy-eight".