1978579 has 4 divisors (see below), whose sum is σ = 2094984. Its totient is φ = 1862176.

The previous prime is 1978567. The next prime is 1978589. The reversal of 1978579 is 9758791.

1978579 = T₁₁₄₇ + T₁₁₄₈ + T₁₁₄₉.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978589) 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, 58177 + ... + 58210.

It is an arithmetic number, because the mean of its divisors is an integer number (523746).

2^1978579 is an apocalyptic number.

1978579 is the 1149-th centered triangular number.

1978579 is a deficient number, since it is larger than the sum of its proper divisors (116405).

1978579 is a wasteful number, since it uses less digits than its factorization.

1978579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116404.

The product of its digits is 158760, while the sum is 46.

The square root of 1978579 is about 1406.6197069571. The cubic root of 1978579 is about 125.5406766449.

The spelling of 1978579 in words is "one million, nine hundred seventy-eight thousand, five hundred seventy-nine".