1803421949 has 4 divisors (see below), whose sum is σ = 2061053664. Its totient is φ = 1545790236.

The previous prime is 1803421901. The next prime is 1803421969. The reversal of 1803421949 is 9491243081.

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 a de Polignac number, because none of the positive numbers 2^k-1803421949 is a prime.

It is a super-2 number, since 2×1803421949² = 6504661452269917202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1803421969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128815847 + ... + 128815860.

It is an arithmetic number, because the mean of its divisors is an integer number (515263416).

Almost surely, 2^1803421949 is an apocalyptic number.

It is an amenable number.

1803421949 is a deficient number, since it is larger than the sum of its proper divisors (257631715).

1803421949 is an equidigital number, since it uses as much as digits as its factorization.

1803421949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257631714.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1803421949 is about 42466.7157783599. The cubic root of 1803421949 is about 1217.2107624436.

The spelling of 1803421949 in words is "one billion, eight hundred three million, four hundred twenty-one thousand, nine hundred forty-nine".