1861608 has 48 divisors (see below), whose sum is σ = 5417280. Its totient is φ = 531552.

The previous prime is 1861591. The next prime is 1861621. The reversal of 1861608 is 8061681.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 385 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2^1861608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2708640).

1861608 is an abundant number, since it is smaller than the sum of its proper divisors (3555672).

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

1861608 is a wasteful number, since it uses less digits than its factorization.

1861608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1861608 is about 1364.4075637433. The cubic root of 1861608 is about 123.0163240943.

The spelling of 1861608 in words is "one million, eight hundred sixty-one thousand, six hundred eight".