1861992 has 48 divisors (see below), whose sum is σ = 5503680. Its totient is φ = 564000.

The previous prime is 1861991. The next prime is 1862009. The reversal of 1861992 is 2991681.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1861991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 384 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (114660).

2^1861992 is an apocalyptic number.

1861992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1861992 is an abundant number, since it is smaller than the sum of its proper divisors (3641688).

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

1861992 is a wasteful number, since it uses less digits than its factorization.

1861992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374 (or 2367 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 1861992 is about 1364.5482769034. The cubic root of 1861992 is about 123.0247818399.

The spelling of 1861992 in words is "one million, eight hundred sixty-one thousand, nine hundred ninety-two".