1861485 has 16 divisors (see below), whose sum is σ = 2998464. Its totient is φ = 986112.

The previous prime is 1861471. The next prime is 1861493. The reversal of 1861485 is 5841681.

1861485 is a nontrivial binomial coefficient, being equal to C(1930, 2).

It is not a de Polignac number, because 1861485 - 2⁴ = 1861469 is a prime.

1861485 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 2574 + ... + 3216.

It is an arithmetic number, because the mean of its divisors is an integer number (187404).

2^1861485 is an apocalyptic number.

1861485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1861485 is the 1929-th triangular number and also the 965-th hexagonal number.

It is an amenable number.

1861485 is a deficient number, since it is larger than the sum of its proper divisors (1136979).

1861485 is a wasteful number, since it uses less digits than its factorization.

1861485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844.

The product of its digits is 7680, while the sum is 33.

The square root of 1861485 is about 1364.3624884905. The cubic root of 1861485 is about 123.0136147267.

It can be divided in two parts, 1861 and 485, that added together give a triangular number (2346 = T₆₈).

The spelling of 1861485 in words is "one million, eight hundred sixty-one thousand, four hundred eighty-five".