1872281 has 2 divisors, whose sum is σ = 1872282. Its totient is φ = 1872280.

The previous prime is 1872271. The next prime is 1872287. The reversal of 1872281 is 1822781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 697225 = 1084^2 + 835^2 .

It is an emirp because it is prime and its reverse (1822781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1872281 - 2⁶ = 1872217 is a prime.

It is a super-2 number, since 2×1872281² = 7010872285922, which contains 22 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 1 + 8² + 7⁷ + 2⁵ + 2²⁰ + 8² + 1 .

It is not a weakly prime, because it can be changed into another prime (1872287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936140 + 936141.

It is an arithmetic number, because the mean of its divisors is an integer number (936141).

2^1872281 is an apocalyptic number.

It is an amenable number.

1872281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872281 is an equidigital number, since it uses as much as digits as its factorization.

1872281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 29.

The square root of 1872281 is about 1368.3131951421. The cubic root of 1872281 is about 123.2509692757.

The spelling of 1872281 in words is "one million, eight hundred seventy-two thousand, two hundred eighty-one".