1861039 has 2 divisors, whose sum is σ = 1861040. Its totient is φ = 1861038.

The previous prime is 1861033. The next prime is 1861061. The reversal of 1861039 is 9301681.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9301681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1861039 - 2¹⁵ = 1828271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1860998 and 1861016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930519 + 930520.

It is an arithmetic number, because the mean of its divisors is an integer number (930520).

2^1861039 is an apocalyptic number.

1861039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861039 is an equidigital number, since it uses as much as digits as its factorization.

1861039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1861039 is about 1364.1990323996. The cubic root of 1861039 is about 123.0037895146.

It can be divided in two parts, 186 and 1039, that added together give a triangular number (1225 = T₄₉).

The spelling of 1861039 in words is "one million, eight hundred sixty-one thousand, thirty-nine".