1678138927 has 2 divisors, whose sum is σ = 1678138928. Its totient is φ = 1678138926.

The previous prime is 1678138921. The next prime is 1678138961. The reversal of 1678138927 is 7298318761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1678138927 - 2¹⁹ = 1677614639 is a prime.

It is a super-2 number, since 2×1678138927² = 5632300516625422658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678138921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839069463 + 839069464.

It is an arithmetic number, because the mean of its divisors is an integer number (839069464).

Almost surely, 2^1678138927 is an apocalyptic number.

1678138927 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678138927 is an equidigital number, since it uses as much as digits as its factorization.

1678138927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 1678138927 is about 40965.0940069713. The cubic root of 1678138927 is about 1188.3452572208.

The spelling of 1678138927 in words is "one billion, six hundred seventy-eight million, one hundred thirty-eight thousand, nine hundred twenty-seven".