1978039 has 4 divisors (see below), whose sum is σ = 2260624. Its totient is φ = 1695456.

The previous prime is 1978037. The next prime is 1978051. The reversal of 1978039 is 9308791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9308791 = 1483 ⋅6277.

It is not a de Polignac number, because 1978039 - 2¹ = 1978037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1977989 and 1978007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141282 + ... + 141295.

It is an arithmetic number, because the mean of its divisors is an integer number (565156).

2^1978039 is an apocalyptic number.

1978039 is a deficient number, since it is larger than the sum of its proper divisors (282585).

1978039 is an equidigital number, since it uses as much as digits as its factorization.

1978039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282584.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 1978039 is about 1406.4277443225. The cubic root of 1978039 is about 125.5292546204.

The spelling of 1978039 in words is "one million, nine hundred seventy-eight thousand, thirty-nine".