666434 has 12 divisors (see below), whose sum is σ = 1062834. Its totient is φ = 313344.

The previous prime is 666433. The next prime is 666437. The reversal of 666434 is 434666.

It can be written as a sum of positive squares in 3 ways, for example, as 664225 + 2209 = 815^2 + 47^2 .

It is a junction number, because it is equal to n+sod(n) for n = 666397 and 666406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2 + ... + 1154.

2⁶⁶⁶⁴³⁴ is an apocalyptic number.

666434 is a deficient number, since it is larger than the sum of its proper divisors (396400).

666434 is a wasteful number, since it uses less digits than its factorization.

666434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189 (or 1172 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 666434 is about 816.3540898409. The cubic root of 666434 is about 87.3478826384.

It can be divided in two parts, 6664 and 34, that multiplied together give a square (226576 = 476²).

The spelling of 666434 in words is "six hundred sixty-six thousand, four hundred thirty-four".