1861220160 has 224 divisors, whose sum is σ = 6778752000. Its totient is φ = 480245760.

The previous prime is 1861220159. The next prime is 1861220161. The reversal of 1861220160 is 610221681.

1861220160 is a `hidden beast` number, since 18 + 612 + 20 + 16 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1861220159) and next prime (1861220161).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861220161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264366 + ... + 271314.

Almost surely, 2^1861220160 is an apocalyptic number.

1861220160 is a gapful number since it is divisible by the number (10) 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 1861220160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3389376000).

1861220160 is an abundant number, since it is smaller than the sum of its proper divisors (4917531840).

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

1861220160 is a wasteful number, since it uses less digits than its factorization.

1861220160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006 (or 6990 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1861220160 is about 43141.8608778064. The cubic root of 1861220160 is about 1230.0778059050.

The spelling of 1861220160 in words is "one billion, eight hundred sixty-one million, two hundred twenty thousand, one hundred sixty".