2041978 has 4 divisors (see below), whose sum is σ = 3062970. Its totient is φ = 1020988.

The previous prime is 2041967. The next prime is 2041997. The reversal of 2041978 is 8791402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8791402 = 2 ⋅4395701.

It can be written as a sum of positive squares in only one way, i.e., 1570009 + 471969 = 1253^2 + 687^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510493 + ... + 510496.

2^2041978 is an apocalyptic number.

2041978 is a deficient number, since it is larger than the sum of its proper divisors (1020992).

2041978 is a wasteful number, since it uses less digits than its factorization.

2041978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020991.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2041978 is about 1428.9779564430. The cubic root of 2041978 is about 126.8674915275.

The spelling of 2041978 in words is "two million, forty-one thousand, nine hundred seventy-eight".