1878978 has 8 divisors (see below), whose sum is σ = 3757968. Its totient is φ = 626324.

The previous prime is 1878977. The next prime is 1878979. The reversal of 1878978 is 8798781.

It is an interprime number because it is at equal distance from previous prime (1878977) and next prime (1878979).

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

1878978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1878977) 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, 156576 + ... + 156587.

It is an arithmetic number, because the mean of its divisors is an integer number (469746).

2^1878978 is an apocalyptic number.

1878978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1878978 is a wasteful number, since it uses less digits than its factorization.

1878978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313168.

The product of its digits is 225792, while the sum is 48.

The square root of 1878978 is about 1370.7581843637. The cubic root of 1878978 is about 123.3977473765.

The spelling of 1878978 in words is "one million, eight hundred seventy-eight thousand, nine hundred seventy-eight".