2091428 has 6 divisors (see below), whose sum is σ = 3660006. Its totient is φ = 1045712.

The previous prime is 2091421. The next prime is 2091431. The reversal of 2091428 is 8241902.

It can be written as a sum of positive squares in only one way, i.e., 2050624 + 40804 = 1432^2 + 202^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2091397 and 2091406.

It is not an unprimeable number, because it can be changed into a prime (2091421) 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 as a sum of consecutive naturals, namely, 261425 + ... + 261432.

It is an arithmetic number, because the mean of its divisors is an integer number (610001).

2^2091428 is an apocalyptic number.

It is an amenable number.

2091428 is a deficient number, since it is larger than the sum of its proper divisors (1568578).

2091428 is a wasteful number, since it uses less digits than its factorization.

2091428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522861 (or 522859 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2091428 is about 1446.1770292741. The cubic root of 2091428 is about 127.8834388095.

The spelling of 2091428 in words is "two million, ninety-one thousand, four hundred twenty-eight".