1861046880 has 384 divisors, whose sum is σ = 7485198336. Its totient is φ = 377395200.

The previous prime is 1861046851. The next prime is 1861046881. The reversal of 1861046880 is 886401681.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861046881) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1588695 + ... + 1589865.

It is an arithmetic number, because the mean of its divisors is an integer number (19492704).

Almost surely, 2^1861046880 is an apocalyptic number.

1861046880 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 1861046880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3742599168).

1861046880 is an abundant number, since it is smaller than the sum of its proper divisors (5624151456).

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

1861046880 is a wasteful number, since it uses less digits than its factorization.

1861046880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 1861046880 is about 43139.8525727662. The cubic root of 1861046880 is about 1230.0396312169.

The spelling of 1861046880 in words is "one billion, eight hundred sixty-one million, forty-six thousand, eight hundred eighty".