1918493 has 4 divisors (see below), whose sum is σ = 1959360. Its totient is φ = 1877628.

The previous prime is 1918489. The next prime is 1918507. The reversal of 1918493 is 3948191.

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.

It is a cyclic number.

It is not a de Polignac number, because 1918493 - 2² = 1918489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918463) 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, 20363 + ... + 20456.

It is an arithmetic number, because the mean of its divisors is an integer number (489840).

2^1918493 is an apocalyptic number.

It is an amenable number.

1918493 is a deficient number, since it is larger than the sum of its proper divisors (40867).

1918493 is an equidigital number, since it uses as much as digits as its factorization.

1918493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40866.

The product of its digits is 7776, while the sum is 35.

The square root of 1918493 is about 1385.0967475234. The cubic root of 1918493 is about 124.2567736754.

The spelling of 1918493 in words is "one million, nine hundred eighteen thousand, four hundred ninety-three".