1678712123 has 4 divisors (see below), whose sum is σ = 1831322328. Its totient is φ = 1526101920.

The previous prime is 1678712099. The next prime is 1678712129. The reversal of 1678712123 is 3212178761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1678712123 - 2¹⁶ = 1678646587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1678712129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76305086 + ... + 76305107.

It is an arithmetic number, because the mean of its divisors is an integer number (457830582).

Almost surely, 2^1678712123 is an apocalyptic number.

1678712123 is a deficient number, since it is larger than the sum of its proper divisors (152610205).

1678712123 is a wasteful number, since it uses less digits than its factorization.

1678712123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152610204.

The product of its digits is 28224, while the sum is 38.

The square root of 1678712123 is about 40972.0895610658. The cubic root of 1678712123 is about 1188.4805414531.

The spelling of 1678712123 in words is "one billion, six hundred seventy-eight million, seven hundred twelve thousand, one hundred twenty-three".