1678406423 has 4 divisors (see below), whose sum is σ = 1695709680. Its totient is φ = 1661103168.

The previous prime is 1678406369. The next prime is 1678406449. The reversal of 1678406423 is 3246048761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3246048761 = 41 ⋅79171921.

It is a cyclic number.

It is not a de Polignac number, because 1678406423 - 2⁸ = 1678406167 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 (1678402423) 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, 8651483 + ... + 8651676.

It is an arithmetic number, because the mean of its divisors is an integer number (423927420).

Almost surely, 2^1678406423 is an apocalyptic number.

1678406423 is a deficient number, since it is larger than the sum of its proper divisors (17303257).

1678406423 is an equidigital number, since it uses as much as digits as its factorization.

1678406423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17303256.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 1678406423 is about 40968.3588028615. The cubic root of 1678406423 is about 1188.4083947655.

The spelling of 1678406423 in words is "one billion, six hundred seventy-eight million, four hundred six thousand, four hundred twenty-three".