1978927 has 2 divisors, whose sum is σ = 1978928. Its totient is φ = 1978926.

The previous prime is 1978913. The next prime is 1978981. The reversal of 1978927 is 7298791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1978927 - 2⁷ = 1978799 is a prime.

1978927 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989463 + 989464.

It is an arithmetic number, because the mean of its divisors is an integer number (989464).

2^1978927 is an apocalyptic number.

1978927 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978927 is an equidigital number, since it uses as much as digits as its factorization.

1978927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 43.

The square root of 1978927 is about 1406.7434023304. The cubic root of 1978927 is about 125.5480364040.

The spelling of 1978927 in words is "one million, nine hundred seventy-eight thousand, nine hundred twenty-seven".