53443709 has 4 divisors (see below), whose sum is σ = 58302240. Its totient is φ = 48585180.

The previous prime is 53443667. The next prime is 53443717. The reversal of 53443709 is 90734435.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53443709 - 2¹⁶ = 53378173 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 (53443729) 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, 2429249 + ... + 2429270.

It is an arithmetic number, because the mean of its divisors is an integer number (14575560).

Almost surely, 2^53443709 is an apocalyptic number.

It is an amenable number.

53443709 is a deficient number, since it is larger than the sum of its proper divisors (4858531).

53443709 is a wasteful number, since it uses less digits than its factorization.

53443709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4858530.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 53443709 is about 7310.5204329104. The cubic root of 53443709 is about 376.6739013238.

The spelling of 53443709 in words is "fifty-three million, four hundred forty-three thousand, seven hundred nine".