53390340 has 60 divisors (see below), whose sum is σ = 167492556. Its totient is φ = 14236992.

The previous prime is 53390327. The next prime is 53390341. The reversal of 53390340 is 4309335.

53390340 is a `hidden beast` number, since 533 + 90 + 3 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 39237696 + 14152644 = 6264^2 + 3762^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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 (53390341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14859 + ... + 18098.

Almost surely, 2^53390340 is an apocalyptic number.

It is an amenable number.

53390340 is an abundant number, since it is smaller than the sum of its proper divisors (114102216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53390340 is a wasteful number, since it uses less digits than its factorization.

53390340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32978 (or 32967 counting only the distinct ones).

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

The square root of 53390340 is about 7306.8693706676. The cubic root of 53390340 is about 376.5484771154.

Adding to 53390340 its reverse (4309335), we get a palindrome (57699675).

The spelling of 53390340 in words is "fifty-three million, three hundred ninety thousand, three hundred forty".