1872373781 has 2 divisors, whose sum is σ = 1872373782. Its totient is φ = 1872373780.

The previous prime is 1872373747. The next prime is 1872373801. The reversal of 1872373781 is 1873732781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1641060100 + 231313681 = 40510^2 + 15209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872373781 - 2¹⁴ = 1872357397 is a prime.

It is a super-2 number, since 2×1872373781² = 7011567151552471922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1872373721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936186890 + 936186891.

It is an arithmetic number, because the mean of its divisors is an integer number (936186891).

Almost surely, 2^1872373781 is an apocalyptic number.

It is an amenable number.

1872373781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872373781 is an equidigital number, since it uses as much as digits as its factorization.

1872373781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 47.

The square root of 1872373781 is about 43270.9345981803. The cubic root of 1872373781 is about 1232.5300514515.

The spelling of 1872373781 in words is "one billion, eight hundred seventy-two million, three hundred seventy-three thousand, seven hundred eighty-one".