1800461 has 4 divisors (see below), whose sum is σ = 1938972. Its totient is φ = 1661952.

The previous prime is 1800451. The next prime is 1800473. The reversal of 1800461 is 1640081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1640081 = 373 ⋅4397.

It can be written as a sum of positive squares in 2 ways, for example, as 126025 + 1674436 = 355^2 + 1294^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800461 - 2⁶ = 1800397 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 (1800401) 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, 69236 + ... + 69261.

It is an arithmetic number, because the mean of its divisors is an integer number (484743).

2^1800461 is an apocalyptic number.

It is an amenable number.

1800461 is a deficient number, since it is larger than the sum of its proper divisors (138511).

1800461 is a wasteful number, since it uses less digits than its factorization.

1800461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138510.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1800461 is about 1341.8125800573. The cubic root of 1800461 is about 121.6544238218.

The spelling of 1800461 in words is "one million, eight hundred thousand, four hundred sixty-one".