1800813725 has 12 divisors (see below), whose sum is σ = 2310010260. Its totient is φ = 1390972800.

The previous prime is 1800813709. The next prime is 1800813737. The reversal of 1800813725 is 5273180081.

It can be written as a sum of positive squares in 6 ways, for example, as 197852356 + 1602961369 = 14066^2 + 40037^2 .

It is not a de Polignac number, because 1800813725 - 2⁴ = 1800813709 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1241216 + ... + 1242665.

It is an arithmetic number, because the mean of its divisors is an integer number (192500855).

Almost surely, 2^1800813725 is an apocalyptic number.

It is an amenable number.

1800813725 is a deficient number, since it is larger than the sum of its proper divisors (509196535).

1800813725 is a wasteful number, since it uses less digits than its factorization.

1800813725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483920 (or 2483915 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 1800813725 is about 42435.9956287112. The cubic root of 1800813725 is about 1216.6236766779.

The spelling of 1800813725 in words is "one billion, eight hundred million, eight hundred thirteen thousand, seven hundred twenty-five".