1666434 has 32 divisors (see below), whose sum is σ = 4156416. Its totient is φ = 432720.

The previous prime is 1666429. The next prime is 1666447. The reversal of 1666434 is 4346661.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

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, 1342 + ... + 2265.

It is an arithmetic number, because the mean of its divisors is an integer number (129888).

2^1666434 is an apocalyptic number.

1666434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1666434 is an abundant number, since it is smaller than the sum of its proper divisors (2489982).

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

1666434 is a wasteful number, since it uses less digits than its factorization.

1666434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630.

The product of its digits is 10368, while the sum is 30.

The square root of 1666434 is about 1290.9043341782. The cubic root of 1666434 is about 118.5575927562.

It can be divided in two parts, 1 and 666434, that added together give a triangular number (666435 = T₁₁₅₄).

The spelling of 1666434 in words is "one million, six hundred sixty-six thousand, four hundred thirty-four".