1428641 has 4 divisors (see below), whose sum is σ = 1450032. Its totient is φ = 1407252.

The previous prime is 1428631. The next prime is 1428649. The reversal of 1428641 is 1468241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1428641 - 2¹⁰ = 1427617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1428641.

It is not an unprimeable number, because it can be changed into a prime (1428649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10595 + ... + 10728.

It is an arithmetic number, because the mean of its divisors is an integer number (362508).

2^1428641 is an apocalyptic number.

It is an amenable number.

1428641 is a deficient number, since it is larger than the sum of its proper divisors (21391).

1428641 is an equidigital number, since it uses as much as digits as its factorization.

1428641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21390.

The product of its digits is 1536, while the sum is 26.

The square root of 1428641 is about 1195.2577127967. The cubic root of 1428641 is about 112.6266162904.

The spelling of 1428641 in words is "one million, four hundred twenty-eight thousand, six hundred forty-one".