1783881 has 24 divisors (see below), whose sum is σ = 2892864. Its totient is φ = 1049760.

The previous prime is 1783879. The next prime is 1783883. The reversal of 1783881 is 1883871.

It is an interprime number because it is at equal distance from previous prime (1783879) and next prime (1783883).

It is not a de Polignac number, because 1783881 - 2¹ = 1783879 is a prime.

It is a super-2 number, since 2×1783881² = 6364462844322, which contains 22 as substring.

1783881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1783883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3420 + ... + 3906.

It is an arithmetic number, because the mean of its divisors is an integer number (120536).

2^1783881 is an apocalyptic number.

1783881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1783881 is a deficient number, since it is larger than the sum of its proper divisors (1108983).

1783881 is a wasteful number, since it uses less digits than its factorization.

1783881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 538 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 1783881 is about 1335.6200807116. The cubic root of 1783881 is about 121.2798431519.

The spelling of 1783881 in words is "one million, seven hundred eighty-three thousand, eight hundred eighty-one".