228021905 has 8 divisors (see below), whose sum is σ = 279989952. Its totient is φ = 178175088.

The previous prime is 228021883. The next prime is 228021919. The reversal of 228021905 is 509120822.

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 228021905 - 2¹² = 228017809 is a prime.

It is a Duffinian 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, 530069 + ... + 530498.

It is an arithmetic number, because the mean of its divisors is an integer number (34998744).

Almost surely, 2^228021905 is an apocalyptic number.

It is an amenable number.

228021905 is a deficient number, since it is larger than the sum of its proper divisors (51968047).

228021905 is a wasteful number, since it uses less digits than its factorization.

228021905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060615.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 228021905 is about 15100.3942001525. The cubic root of 228021905 is about 610.9310381531.

The spelling of 228021905 in words is "two hundred twenty-eight million, twenty-one thousand, nine hundred five".