1428660 has 36 divisors (see below), whose sum is σ = 4334148. Its totient is φ = 380928.

The previous prime is 1428649. The next prime is 1428671. The reversal of 1428660 is 668241.

It is an interprime number because it is at equal distance from previous prime (1428649) and next prime (1428671).

It can be written as a sum of positive squares in 2 ways, for example, as 1089936 + 338724 = 1044^2 + 582^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3789 + ... + 4148.

It is an arithmetic number, because the mean of its divisors is an integer number (120393).

2^1428660 is an apocalyptic number.

1428660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1428660 is an abundant number, since it is smaller than the sum of its proper divisors (2905488).

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

1428660 is a wasteful number, since it uses less digits than its factorization.

1428660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7952 (or 7947 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1428660 is about 1195.2656608470. The cubic root of 1428660 is about 112.6271155752.

The spelling of 1428660 in words is "one million, four hundred twenty-eight thousand, six hundred sixty".