1678945723 has 8 divisors (see below), whose sum is σ = 2066394848. Its totient is φ = 1328396544.

The previous prime is 1678945717. The next prime is 1678945727. The reversal of 1678945723 is 3275498761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1678945723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1678945727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9224886 + ... + 9225067.

It is an arithmetic number, because the mean of its divisors is an integer number (258299356).

Almost surely, 2^1678945723 is an apocalyptic number.

1678945723 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1678945723 is a deficient number, since it is larger than the sum of its proper divisors (387449125).

1678945723 is a wasteful number, since it uses less digits than its factorization.

1678945723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18449973.

The product of its digits is 2540160, while the sum is 52.

The square root of 1678945723 is about 40974.9401829948. The cubic root of 1678945723 is about 1188.5356662864.

The spelling of 1678945723 in words is "one billion, six hundred seventy-eight million, nine hundred forty-five thousand, seven hundred twenty-three".