1872206361 has 9 divisors (see below), whose sum is σ = 2704485589. Its totient is φ = 1248051036.

The previous prime is 1872206359. The next prime is 1872206377. The reversal of 1872206361 is 1636022781.

The square root of 1872206361 is 43269.

It is a perfect power (a square), and thus also a powerful number.

1872206361 is a `hidden beast` number, since 18 + 7 + 2 + 2 + 0 + 636 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1872206361 - 2¹ = 1872206359 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1872206321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 122596 + ... + 137018.

Almost surely, 2^1872206361 is an apocalyptic number.

1872206361 is the 43269-th square number.

1872206361 is the 21635-th centered octagonal number.

It is an amenable number.

1872206361 is a deficient number, since it is larger than the sum of its proper divisors (832279228).

1872206361 is an frugal number, since it uses more digits than its factorization.

1872206361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28852 (or 14426 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The cubic root of 1872206361 is about 1232.4933144257.

Multiplying 1872206361 by its sum of digits (36), we get a square (67399428996 = 259614²).

The spelling of 1872206361 in words is "one billion, eight hundred seventy-two million, two hundred six thousand, three hundred sixty-one".