671439042 has 24 divisors (see below), whose sum is σ = 1490268780. Its totient is φ = 218353920.

The previous prime is 671438993. The next prime is 671439047. The reversal of 671439042 is 240934176.

It can be written as a sum of positive squares in 2 ways, for example, as 668274201 + 3164841 = 25851^2 + 1779^2 .

It is a junction number, because it is equal to n+sod(n) for n = 671438988 and 671439006.

It is not an unprimeable number, because it can be changed into a prime (671439047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454167 + ... + 455642.

Almost surely, 2^671439042 is an apocalyptic number.

671439042 is an abundant number, since it is smaller than the sum of its proper divisors (818829738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671439042 is a wasteful number, since it uses less digits than its factorization.

671439042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909858 (or 909855 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 671439042 is about 25912.1408224022. The cubic root of 671439042 is about 875.6600372825.

The spelling of 671439042 in words is "six hundred seventy-one million, four hundred thirty-nine thousand, forty-two".