1666437 has 8 divisors (see below), whose sum is σ = 2243904. Its totient is φ = 1099968.

The previous prime is 1666429. The next prime is 1666447. The reversal of 1666437 is 7346661.

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

It is not a de Polignac number, because 1666437 - 2³ = 1666429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666398 and 1666407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2388 + ... + 3005.

It is an arithmetic number, because the mean of its divisors is an integer number (280488).

2^1666437 is an apocalyptic number.

It is an amenable number.

1666437 is a deficient number, since it is larger than the sum of its proper divisors (577467).

1666437 is a wasteful number, since it uses less digits than its factorization.

1666437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499.

The product of its digits is 18144, while the sum is 33.

The square root of 1666437 is about 1290.9054961538. The cubic root of 1666437 is about 118.5576639006.

The spelling of 1666437 in words is "one million, six hundred sixty-six thousand, four hundred thirty-seven".