671426394 has 32 divisors (see below), whose sum is σ = 1358739456. Its totient is φ = 221175360.

The previous prime is 671426369. The next prime is 671426411. The reversal of 671426394 is 493624176.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209484 + ... + 212664.

It is an arithmetic number, because the mean of its divisors is an integer number (42460608).

Almost surely, 2^671426394 is an apocalyptic number.

671426394 is an abundant number, since it is smaller than the sum of its proper divisors (687313062).

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

671426394 is a wasteful number, since it uses less digits than its factorization.

671426394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590.

The product of its digits is 217728, while the sum is 42.

The square root of 671426394 is about 25911.8967657715. The cubic root of 671426394 is about 875.6545389339.

It can be divided in two parts, 67142 and 6394, that added together give a triangular number (73536 = T₃₈₃).

The spelling of 671426394 in words is "six hundred seventy-one million, four hundred twenty-six thousand, three hundred ninety-four".