1628791 has 6 divisors (see below), whose sum is σ = 1703240. Its totient is φ = 1557468.

The previous prime is 1628779. The next prime is 1628801. The reversal of 1628791 is 1978261.

It is a happy number.

It is not a de Polignac number, because 1628791 - 2⁹ = 1628279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1011 + ... + 2068.

2^1628791 is an apocalyptic number.

1628791 is a deficient number, since it is larger than the sum of its proper divisors (74449).

1628791 is an equidigital number, since it uses as much as digits as its factorization.

1628791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3125 (or 3102 counting only the distinct ones).

The product of its digits is 6048, while the sum is 34.

The square root of 1628791 is about 1276.2409647085. The cubic root of 1628791 is about 117.6580880983.

The spelling of 1628791 in words is "one million, six hundred twenty-eight thousand, seven hundred ninety-one".