55338729 has 4 divisors (see below), whose sum is σ = 73784976. Its totient is φ = 36892484.

The previous prime is 55338719. The next prime is 55338733. The reversal of 55338729 is 92783355.

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 55338729 - 2¹⁶ = 55273193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55338719) 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, 9223119 + ... + 9223124.

It is an arithmetic number, because the mean of its divisors is an integer number (18446244).

Almost surely, 2^55338729 is an apocalyptic number.

It is an amenable number.

55338729 is a deficient number, since it is larger than the sum of its proper divisors (18446247).

55338729 is a wasteful number, since it uses less digits than its factorization.

55338729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18446246.

The product of its digits is 226800, while the sum is 42.

The square root of 55338729 is about 7439.0005377067. Note that the first 3 decimals coincide. The cubic root of 55338729 is about 381.0743580801.

The spelling of 55338729 in words is "fifty-five million, three hundred thirty-eight thousand, seven hundred twenty-nine".