1861417 has 2 divisors, whose sum is σ = 1861418. Its totient is φ = 1861416.

The previous prime is 1861403. The next prime is 1861469. The reversal of 1861417 is 7141681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1819801 + 41616 = 1349^2 + 204^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861417 - 2¹¹ = 1859369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1861817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930708 + 930709.

It is an arithmetic number, because the mean of its divisors is an integer number (930709).

2^1861417 is an apocalyptic number.

It is an amenable number.

1861417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861417 is an equidigital number, since it uses as much as digits as its factorization.

1861417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 1861417 is about 1364.3375681993. The cubic root of 1861417 is about 123.0121168137.

It can be divided in two parts, 1861 and 417, that added together give a triangular number (2278 = T₆₇).

The spelling of 1861417 in words is "one million, eight hundred sixty-one thousand, four hundred seventeen".