1861245 has 32 divisors (see below), whose sum is σ = 3507840. Its totient is φ = 933120.

The previous prime is 1861219. The next prime is 1861253. The reversal of 1861245 is 5421681.

1861245 is a `hidden beast` number, since 1 + 8 + 612 + 45 = 666.

It is not a de Polignac number, because 1861245 - 2¹¹ = 1859197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 1890 + ... + 2700.

It is an arithmetic number, because the mean of its divisors is an integer number (109620).

2^1861245 is an apocalyptic number.

1861245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1861245 is a deficient number, since it is larger than the sum of its proper divisors (1646595).

1861245 is a wasteful number, since it uses less digits than its factorization.

1861245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 836 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1861245 is about 1364.2745324897. The cubic root of 1861245 is about 123.0083278121.

It can be divided in two parts, 186 and 1245, that added together give a triangular number (1431 = T₅₃).

The spelling of 1861245 in words is "one million, eight hundred sixty-one thousand, two hundred forty-five".