1678712122 has 4 divisors (see below), whose sum is σ = 2518068186. Its totient is φ = 839356060.

The previous prime is 1678712099. The next prime is 1678712129. The reversal of 1678712122 is 2212178761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2212178761 = 13 ⋅170167597.

It can be written as a sum of positive squares in only one way, i.e., 1548501201 + 130210921 = 39351^2 + 11411^2 .

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 as a sum of consecutive naturals, namely, 419678029 + ... + 419678032.

Almost surely, 2^1678712122 is an apocalyptic number.

1678712122 is a deficient number, since it is larger than the sum of its proper divisors (839356064).

1678712122 is an equidigital number, since it uses as much as digits as its factorization.

1678712122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839356063.

The product of its digits is 18816, while the sum is 37.

The square root of 1678712122 is about 40972.0895488624. The cubic root of 1678712122 is about 1188.4805412171.

The spelling of 1678712122 in words is "one billion, six hundred seventy-eight million, seven hundred twelve thousand, one hundred twenty-two".