55389905 has 8 divisors (see below), whose sum is σ = 67460352. Its totient is φ = 43650288.

The previous prime is 55389853. The next prime is 55389931. The reversal of 55389905 is 50998355.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55389905 - 2¹⁶ = 55324369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82337 + ... + 83006.

It is an arithmetic number, because the mean of its divisors is an integer number (8432544).

Almost surely, 2^55389905 is an apocalyptic number.

It is an amenable number.

55389905 is a deficient number, since it is larger than the sum of its proper divisors (12070447).

55389905 is a wasteful number, since it uses less digits than its factorization.

55389905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165415.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 55389905 is about 7442.4394522226. The cubic root of 55389905 is about 381.1917915254.

The spelling of 55389905 in words is "fifty-five million, three hundred eighty-nine thousand, nine hundred five".