1820546 has 24 divisors (see below), whose sum is σ = 3423420. Its totient is φ = 719712.

The previous prime is 1820527. The next prime is 1820549. The reversal of 1820546 is 6450281.

1820546 = T₂₆ + T₂₇ + ... + T₂₂₁.

It can be written as a sum of positive squares in 2 ways, for example, as 1466521 + 354025 = 1211^2 + 595^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

1820546 is a modest number, since divided by 546 gives 182 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1820549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 560 + ... + 1988.

2^1820546 is an apocalyptic number.

1820546 is a deficient number, since it is larger than the sum of its proper divisors (1602874).

1820546 is a wasteful number, since it uses less digits than its factorization.

1820546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458 (or 1451 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1820546 is about 1349.2761022118. The cubic root of 1820546 is about 122.1051230455.

The spelling of 1820546 in words is "one million, eight hundred twenty thousand, five hundred forty-six".