1428666 has 16 divisors (see below), whose sum is σ = 2949888. Its totient is φ = 460800.

The previous prime is 1428649. The next prime is 1428671. The reversal of 1428666 is 6668241.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3655 + ... + 4026.

It is an arithmetic number, because the mean of its divisors is an integer number (184368).

2^1428666 is an apocalyptic number.

1428666 is an abundant number, since it is smaller than the sum of its proper divisors (1521222).

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

1428666 is a wasteful number, since it uses less digits than its factorization.

1428666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7717.

The product of its digits is 13824, while the sum is 33.

The square root of 1428666 is about 1195.2681707466. The cubic root of 1428666 is about 112.6272732432.

It can be divided in two parts, 14 and 28666, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 1428666 in words is "one million, four hundred twenty-eight thousand, six hundred sixty-six".