1881618 has 8 divisors (see below), whose sum is σ = 3763248. Its totient is φ = 627204.

The previous prime is 1881617. The next prime is 1881619. The reversal of 1881618 is 8161881.

It is an interprime number because it is at equal distance from previous prime (1881617) and next prime (1881619).

It is a sphenic number, since it is the product of 3 distinct primes.

1881618 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1881617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156796 + ... + 156807.

It is an arithmetic number, because the mean of its divisors is an integer number (470406).

2^1881618 is an apocalyptic number.

1881618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1881618 is a wasteful number, since it uses less digits than its factorization.

1881618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313608.

The product of its digits is 3072, while the sum is 33.

The square root of 1881618 is about 1371.7208170761. The cubic root of 1881618 is about 123.4555123957.

The spelling of 1881618 in words is "one million, eight hundred eighty-one thousand, six hundred eighteen".