1428722 has 4 divisors (see below), whose sum is σ = 2143086. Its totient is φ = 714360.

The previous prime is 1428709. The next prime is 1428751. The reversal of 1428722 is 2278241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2278241 = 7 ⋅325463.

It can be written as a sum of positive squares in only one way, i.e., 790321 + 638401 = 889^2 + 799^2 .

It is a d-powerful number, because it can be written as 1 + 4⁴ + 2⁵ + 8² + 7⁶ + 2¹⁸ + 2²⁰ .

It is a junction number, because it is equal to n+sod(n) for n = 1428691 and 1428700.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357179 + ... + 357182.

2^1428722 is an apocalyptic number.

1428722 is a deficient number, since it is larger than the sum of its proper divisors (714364).

1428722 is an equidigital number, since it uses as much as digits as its factorization.

1428722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714363.

The product of its digits is 1792, while the sum is 26.

The square root of 1428722 is about 1195.2915962224. The cubic root of 1428722 is about 112.6287447896.

The spelling of 1428722 in words is "one million, four hundred twenty-eight thousand, seven hundred twenty-two".