1800729 has 24 divisors (see below), whose sum is σ = 3012672. Its totient is φ = 1015200.

The previous prime is 1800727. The next prime is 1800731. The reversal of 1800729 is 9270081.

It is an interprime number because it is at equal distance from previous prime (1800727) and next prime (1800731).

It is not a de Polignac number, because 1800729 - 2¹ = 1800727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1800727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6222 + ... + 6504.

It is an arithmetic number, because the mean of its divisors is an integer number (125528).

2^1800729 is an apocalyptic number.

1800729 is the 849-th heptagonal number.

It is an amenable number.

1800729 is a deficient number, since it is larger than the sum of its proper divisors (1211943).

1800729 is a wasteful number, since it uses less digits than its factorization.

1800729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1800729 is about 1341.9124412569. The cubic root of 1800729 is about 121.6604596404.

It can be divided in two parts, 180072 and 9, that added together give a palindrome (180081).

The spelling of 1800729 in words is "one million, eight hundred thousand, seven hundred twenty-nine".