53309403 has 30 divisors (see below), whose sum is σ = 89867284. Its totient is φ = 30450168.

The previous prime is 53309363. The next prime is 53309407. The reversal of 53309403 is 30490335.

It is not a de Polignac number, because 53309403 - 2⁶ = 53309339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53309407) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 20376 + ... + 22842.

Almost surely, 2^53309403 is an apocalyptic number.

53309403 is a deficient number, since it is larger than the sum of its proper divisors (36557881).

53309403 is an equidigital number, since it uses as much as digits as its factorization.

53309403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501 (or 2477 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 27.

The square root of 53309403 is about 7301.3288516543. The cubic root of 53309403 is about 376.3581048655.

Adding to 53309403 its reverse (30490335), we get a palindrome (83799738).

The spelling of 53309403 in words is "fifty-three million, three hundred nine thousand, four hundred three".