1978049 has 4 divisors (see below), whose sum is σ = 1980864. Its totient is φ = 1975236.

The previous prime is 1978037. The next prime is 1978051. The reversal of 1978049 is 9408791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9408791 = 7 ⋅1344113.

It is a cyclic number.

It is not a de Polignac number, because 1978049 - 2¹⁶ = 1912513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978349) 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, 644 + ... + 2090.

It is an arithmetic number, because the mean of its divisors is an integer number (495216).

2^1978049 is an apocalyptic number.

It is an amenable number.

1978049 is a deficient number, since it is larger than the sum of its proper divisors (2815).

1978049 is a wasteful number, since it uses less digits than its factorization.

1978049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2814.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1978049 is about 1406.4312994242. The cubic root of 1978049 is about 125.5294661582.

The spelling of 1978049 in words is "one million, nine hundred seventy-eight thousand, forty-nine".