1428638 has 8 divisors (see below), whose sum is σ = 2148120. Its totient is φ = 712600.

The previous prime is 1428631. The next prime is 1428649. The reversal of 1428638 is 8368241.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428631) 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, 893 + ... + 1911.

It is an arithmetic number, because the mean of its divisors is an integer number (268515).

2^1428638 is an apocalyptic number.

1428638 is a deficient number, since it is larger than the sum of its proper divisors (719482).

1428638 is a wasteful number, since it uses less digits than its factorization.

1428638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722.

The product of its digits is 9216, while the sum is 32.

The square root of 1428638 is about 1195.2564578366. The cubic root of 1428638 is about 112.6265374556.

The spelling of 1428638 in words is "one million, four hundred twenty-eight thousand, six hundred thirty-eight".