1861494 has 12 divisors (see below), whose sum is σ = 3729684. Its totient is φ = 619384.

The previous prime is 1861493. The next prime is 1861501. The reversal of 1861494 is 4941681.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861493) 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 in 5 ways as a sum of consecutive naturals, for example, 3064 + ... + 3620.

It is an arithmetic number, because the mean of its divisors is an integer number (310807).

2^1861494 is an apocalyptic number.

1861494 is an abundant number, since it is smaller than the sum of its proper divisors (1868190).

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

1861494 is an frugal number, since it uses more digits than its factorization.

1861494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119 (or 562 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 1861494 is about 1364.3657867302. The cubic root of 1861494 is about 123.0138129771.

The spelling of 1861494 in words is "one million, eight hundred sixty-one thousand, four hundred ninety-four".