1978059 has 4 divisors (see below), whose sum is σ = 2637416. Its totient is φ = 1318704.

The previous prime is 1978051. The next prime is 1978063. The reversal of 1978059 is 9508791.

It is a happy number.

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

It is not a de Polignac number, because 1978059 - 2³ = 1978051 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978051) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 329674 + ... + 329679.

It is an arithmetic number, because the mean of its divisors is an integer number (659354).

2^1978059 is an apocalyptic number.

1978059 is a deficient number, since it is larger than the sum of its proper divisors (659357).

1978059 is an equidigital number, since it uses as much as digits as its factorization.

1978059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659356.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 1978059 is about 1406.4348545169. The cubic root of 1978059 is about 125.5296776954.

It can be divided in two parts, 197 and 8059, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 1978059 in words is "one million, nine hundred seventy-eight thousand, fifty-nine".