671423138 has 8 divisors (see below), whose sum is σ = 1041863580. Its totient is φ = 324135280.

The previous prime is 671423131. The next prime is 671423149. The reversal of 671423138 is 831324176.

It can be written as a sum of positive squares in 2 ways, for example, as 655206409 + 16216729 = 25597^2 + 4027^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 671423098 and 671423107.

It is not an unprimeable number, because it can be changed into a prime (671423131) 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, 5788073 + ... + 5788188.

Almost surely, 2^671423138 is an apocalyptic number.

671423138 is a deficient number, since it is larger than the sum of its proper divisors (370440442).

671423138 is a wasteful number, since it uses less digits than its factorization.

671423138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11576292.

The product of its digits is 24192, while the sum is 35.

The square root of 671423138 is about 25911.8339374117. The cubic root of 671423138 is about 875.6531234719.

The spelling of 671423138 in words is "six hundred seventy-one million, four hundred twenty-three thousand, one hundred thirty-eight".