53440209 has 32 divisors (see below), whose sum is σ = 81780480. Its totient is φ = 34473600.

The previous prime is 53440207. The next prime is 53440213. The reversal of 53440209 is 90204435.

It is not a de Polignac number, because 53440209 - 2¹ = 53440207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (53440207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116709 + ... + 117165.

It is an arithmetic number, because the mean of its divisors is an integer number (2555640).

Almost surely, 2^53440209 is an apocalyptic number.

It is an amenable number.

53440209 is a deficient number, since it is larger than the sum of its proper divisors (28340271).

53440209 is a wasteful number, since it uses less digits than its factorization.

53440209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 53440209 is about 7310.2810479488. The cubic root of 53440209 is about 376.6656784200.

The spelling of 53440209 in words is "fifty-three million, four hundred forty thousand, two hundred nine".