305440421 has 24 divisors (see below), whose sum is σ = 363380472. Its totient is φ = 255024000.

The previous prime is 305440417. The next prime is 305440453. The reversal of 305440421 is 124044503.

It can be written as a sum of positive squares in 4 ways, for example, as 14737921 + 290702500 = 3839^2 + 17050^2 .

It is not a de Polignac number, because 305440421 - 2² = 305440417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305440021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 435371 + ... + 436071.

It is an arithmetic number, because the mean of its divisors is an integer number (15140853).

Almost surely, 2^305440421 is an apocalyptic number.

It is an amenable number.

305440421 is a deficient number, since it is larger than the sum of its proper divisors (57940051).

305440421 is a wasteful number, since it uses less digits than its factorization.

305440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 1002 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 305440421 is about 17476.8538644689. The cubic root of 305440421 is about 673.4553952868.

Adding to 305440421 its reverse (124044503), we get a palindrome (429484924).

The spelling of 305440421 in words is "three hundred five million, four hundred forty thousand, four hundred twenty-one".