1873981 has 8 divisors (see below), whose sum is σ = 1968128. Its totient is φ = 1782000.

The previous prime is 1873979. The next prime is 1874003. The reversal of 1873981 is 1893781.

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

It is a cyclic number.

It is not a de Polignac number, because 1873981 - 2¹ = 1873979 is a prime.

It is a super-2 number, since 2×1873981² = 7023609576722, which contains 22 as substring.

1873981 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1873981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1873181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1396 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (246016).

2^1873981 is an apocalyptic number.

It is an amenable number.

1873981 is a deficient number, since it is larger than the sum of its proper divisors (94147).

1873981 is an equidigital number, since it uses as much as digits as its factorization.

1873981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083.

The product of its digits is 12096, while the sum is 37.

The square root of 1873981 is about 1368.9342570043. The cubic root of 1873981 is about 123.2882612677.

It can be divided in two parts, 187 and 3981, that multiplied together give a palindrome (744447).

The spelling of 1873981 in words is "one million, eight hundred seventy-three thousand, nine hundred eighty-one".