52405421 has 4 divisors (see below), whose sum is σ = 53683644. Its totient is φ = 51127200.

The previous prime is 52405403. The next prime is 52405427. The reversal of 52405421 is 12450425.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9030025 + 43375396 = 3005^2 + 6586^2 .

It is a cyclic number.

It is not a de Polignac number, because 52405421 - 2¹⁴ = 52389037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52405427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639050 + ... + 639131.

It is an arithmetic number, because the mean of its divisors is an integer number (13420911).

Almost surely, 2^52405421 is an apocalyptic number.

It is an amenable number.

52405421 is a deficient number, since it is larger than the sum of its proper divisors (1278223).

52405421 is a wasteful number, since it uses less digits than its factorization.

52405421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278222.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 52405421 is about 7239.1588599781. The cubic root of 52405421 is about 374.2186302127.

Adding to 52405421 its reverse (12450425), we get a palindrome (64855846).

The spelling of 52405421 in words is "fifty-two million, four hundred five thousand, four hundred twenty-one".