1800730172 has 6 divisors (see below), whose sum is σ = 3151277808. Its totient is φ = 900365084.

The previous prime is 1800730163. The next prime is 1800730207. The reversal of 1800730172 is 2710370081.

It is a super-2 number, since 2×1800730172² = 6485258304702299168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225091268 + ... + 225091275.

It is an arithmetic number, because the mean of its divisors is an integer number (525212968).

Almost surely, 2^1800730172 is an apocalyptic number.

It is an amenable number.

1800730172 is a deficient number, since it is larger than the sum of its proper divisors (1350547636).

1800730172 is a wasteful number, since it uses less digits than its factorization.

1800730172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450182547 (or 450182545 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 1800730172 is about 42435.0111582406. The cubic root of 1800730172 is about 1216.6048603452.

The spelling of 1800730172 in words is "one billion, eight hundred million, seven hundred thirty thousand, one hundred seventy-two".