1978018 has 16 divisors (see below), whose sum is σ = 3590784. Its totient is φ = 797760.

The previous prime is 1977991. The next prime is 1978021. The reversal of 1978018 is 8108791.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3918 + ... + 4393.

It is an arithmetic number, because the mean of its divisors is an integer number (224424).

2^1978018 is an apocalyptic number.

1978018 is a deficient number, since it is larger than the sum of its proper divisors (1612766).

1978018 is a wasteful number, since it uses less digits than its factorization.

1978018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8337.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1978018 is about 1406.4202785796. The cubic root of 1978018 is about 125.5288103885.

The spelling of 1978018 in words is "one million, nine hundred seventy-eight thousand, eighteen".