1813949 has 4 divisors (see below), whose sum is σ = 1909440. Its totient is φ = 1718460.

The previous prime is 1813943. The next prime is 1813961. The reversal of 1813949 is 9493181.

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 1813949 - 2¹² = 1809853 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 (1813943) 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, 47717 + ... + 47754.

It is an arithmetic number, because the mean of its divisors is an integer number (477360).

2^1813949 is an apocalyptic number.

1813949 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1813949 is a deficient number, since it is larger than the sum of its proper divisors (95491).

1813949 is an equidigital number, since it uses as much as digits as its factorization.

1813949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95490.

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

The square root of 1813949 is about 1346.8292393618. The cubic root of 1813949 is about 121.9574562758.

The spelling of 1813949 in words is "one million, eight hundred thirteen thousand, nine hundred forty-nine".