1978089 has 8 divisors (see below), whose sum is σ = 2693760. Its totient is φ = 1290576.

The previous prime is 1978087. The next prime is 1978091. The reversal of 1978089 is 9808791.

It is an interprime number because it is at equal distance from previous prime (1978087) and next prime (1978091).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1978089 - 2¹ = 1978087 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1978089.

It is not an unprimeable number, because it can be changed into a prime (1978087) 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 7 ways as a sum of consecutive naturals, for example, 6874 + ... + 7155.

It is an arithmetic number, because the mean of its divisors is an integer number (336720).

2^1978089 is an apocalyptic number.

It is an amenable number.

1978089 is a deficient number, since it is larger than the sum of its proper divisors (715671).

1978089 is a wasteful number, since it uses less digits than its factorization.

1978089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14079.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1978089 is about 1406.4455197412. The cubic root of 1978089 is about 125.5303123026.

The spelling of 1978089 in words is "one million, nine hundred seventy-eight thousand, eighty-nine".