1993481 has 4 divisors (see below), whose sum is σ = 2278272.
Its totient is φ = 1708692.
The previous prime is 1993477. The next prime is 1993483. The reversal of 1993481 is 1843991.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1843991 = 89 ⋅20719.
It is a cyclic number.
It is not a de Polignac number, because 1993481 - 22 = 1993477 is a prime.
It is a super-2 number, since 2×19934812 = 7947932994722, which contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1993483) 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 3 ways as a sum of consecutive naturals, for example, 142385 + ... + 142398.
It is an arithmetic number, because the mean of its divisors is an integer number (569568).
21993481 is an apocalyptic number.
It is an amenable number.
1993481 is a deficient number, since it is larger than the sum of its proper divisors (284791).
1993481 is an equidigital number, since it uses as much as digits as its factorization.
1993481 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 284790.
The product of its digits is 7776, while the sum is 35.
The square root of 1993481 is about 1411.9068666169.
The cubic root of 1993481 is about 125.8550655661.
The spelling of 1993481 in words is "one million, nine hundred ninety-three thousand, four hundred eighty-one".