1851864 has 64 divisors (see below), whose sum is σ = 5399040. Its totient is φ = 518400.

The previous prime is 1851859. The next prime is 1851869. The reversal of 1851864 is 4681581.

It is an interprime number because it is at equal distance from previous prime (1851859) and next prime (1851869).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

Its product of digits (7680) is a multiple of the sum of its prime factors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12189 + ... + 12339.

It is an arithmetic number, because the mean of its divisors is an integer number (84360).

2^1851864 is an apocalyptic number.

1851864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1851864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2699520).

1851864 is an abundant number, since it is smaller than the sum of its proper divisors (3547176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1851864 is a wasteful number, since it uses less digits than its factorization.

1851864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 236 counting only the distinct ones).

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

The square root of 1851864 is about 1360.8320983869. The cubic root of 1851864 is about 122.8013184791.

The spelling of 1851864 in words is "one million, eight hundred fifty-one thousand, eight hundred sixty-four".