1678123213 has 16 divisors (see below), whose sum is σ = 1831032000. Its totient is φ = 1528686720.

The previous prime is 1678123211. The next prime is 1678123241. The reversal of 1678123213 is 3123218761.

It is a cyclic number.

It is not a de Polignac number, because 1678123213 - 2¹ = 1678123211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678123211) 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 15 ways as a sum of consecutive naturals, for example, 798438 + ... + 800536.

It is an arithmetic number, because the mean of its divisors is an integer number (114439500).

Almost surely, 2^1678123213 is an apocalyptic number.

1678123213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1678123213 is a deficient number, since it is larger than the sum of its proper divisors (152908787).

1678123213 is a wasteful number, since it uses less digits than its factorization.

1678123213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892.

The product of its digits is 12096, while the sum is 34.

The square root of 1678123213 is about 40964.9022090863. The cubic root of 1678123213 is about 1188.3415480095.

The spelling of 1678123213 in words is "one billion, six hundred seventy-eight million, one hundred twenty-three thousand, two hundred thirteen".