1978241 has 4 divisors (see below), whose sum is σ = 1996500. Its totient is φ = 1959984.

The previous prime is 1978219. The next prime is 1978267. The reversal of 1978241 is 1428791.

1978241 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 970225 + 1008016 = 985^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 1978241 - 2¹⁴ = 1961857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1978198 and 1978207.

It is not an unprimeable number, because it can be changed into a prime (1978201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8966 + ... + 9183.

It is an arithmetic number, because the mean of its divisors is an integer number (499125).

2^1978241 is an apocalyptic number.

It is an amenable number.

1978241 is a deficient number, since it is larger than the sum of its proper divisors (18259).

1978241 is a wasteful number, since it uses less digits than its factorization.

1978241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18258.

The product of its digits is 4032, while the sum is 32.

The square root of 1978241 is about 1406.4995556345. The cubic root of 1978241 is about 125.5335275470.

The spelling of 1978241 in words is "one million, nine hundred seventy-eight thousand, two hundred forty-one".