1861422192 has 180 divisors, whose sum is σ = 6085844856. Its totient is φ = 529562880.

The previous prime is 1861422179. The next prime is 1861422193. The reversal of 1861422192 is 2912241681.

1861422192 is a `hidden beast` number, since 1 + 8 + 614 + 22 + 19 + 2 = 666.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861422193) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2335138 + ... + 2335934.

Almost surely, 2^1861422192 is an apocalyptic number.

1861422192 is a gapful number since it is divisible by the number (12) 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 1861422192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3042922428).

1861422192 is an abundant number, since it is smaller than the sum of its proper divisors (4224422664).

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

1861422192 is a wasteful number, since it uses less digits than its factorization.

1861422192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 1140 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1861422192 is about 43144.2022988026. The cubic root of 1861422192 is about 1230.1223118503.

The spelling of 1861422192 in words is "one billion, eight hundred sixty-one million, four hundred twenty-two thousand, one hundred ninety-two".