1800401045 has 4 divisors (see below), whose sum is σ = 2160481260. Its totient is φ = 1440320832.

The previous prime is 1800401039. The next prime is 1800401059. The reversal of 1800401045 is 5401040081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5401040081 = 25423 ⋅212447.

It can be written as a sum of positive squares in 2 ways, for example, as 1427177284 + 373223761 = 37778^2 + 19319^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800401045 - 2³⁰ = 726659221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1800401045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180040100 + ... + 180040109.

It is an arithmetic number, because the mean of its divisors is an integer number (540120315).

Almost surely, 2^1800401045 is an apocalyptic number.

It is an amenable number.

1800401045 is a deficient number, since it is larger than the sum of its proper divisors (360080215).

1800401045 is an equidigital number, since it uses as much as digits as its factorization.

1800401045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360080214.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 1800401045 is about 42431.1329686116. The cubic root of 1800401045 is about 1216.5307345060.

The spelling of 1800401045 in words is "one billion, eight hundred million, four hundred one thousand, forty-five".