53398809 has 6 divisors (see below), whose sum is σ = 77131626. Its totient is φ = 35599200.

The previous prime is 53398753. The next prime is 53398817. The reversal of 53398809 is 90889335.

Added to its reverse (90889335) it gives a square (144288144 = 12012²).

It can be written as a sum of positive squares in only one way, i.e., 29192409 + 24206400 = 5403^2 + 4920^2 .

It is not a de Polignac number, because 53398809 - 2⁹ = 53398297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53398109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2966592 + ... + 2966609.

It is an arithmetic number, because the mean of its divisors is an integer number (12855271).

Almost surely, 2^53398809 is an apocalyptic number.

It is an amenable number.

53398809 is a deficient number, since it is larger than the sum of its proper divisors (23732817).

53398809 is a wasteful number, since it uses less digits than its factorization.

53398809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5933207 (or 5933204 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 53398809 is about 7307.4488708441. The cubic root of 53398809 is about 376.5683859631.

Adding to 53398809 its reverse (90889335), we get a square (144288144 = 12012²).

The spelling of 53398809 in words is "fifty-three million, three hundred ninety-eight thousand, eight hundred nine".