1881216 has 96 divisors (see below), whose sum is σ = 5728320. Its totient is φ = 591360.

The previous prime is 1881211. The next prime is 1881221. The reversal of 1881216 is 6121881.

It is an interprime number because it is at equal distance from previous prime (1881211) and next prime (1881221).

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1881216.

It is not an unprimeable number, because it can be changed into a prime (1881211) 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, 26461 + ... + 26531.

It is an arithmetic number, because the mean of its divisors is an integer number (59670).

2^1881216 is an apocalyptic number.

1881216 is a gapful number since it is divisible by the number (16) 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 1881216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2864160).

1881216 is an abundant number, since it is smaller than the sum of its proper divisors (3847104).

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

1881216 is a wasteful number, since it uses less digits than its factorization.

1881216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 99 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1881216 is about 1371.5742779740. The cubic root of 1881216 is about 123.4467198476.

The spelling of 1881216 in words is "one million, eight hundred eighty-one thousand, two hundred sixteen".