228491997 has 8 divisors (see below), whose sum is σ = 307672800. Its totient is φ = 150819600.

The previous prime is 228491969. The next prime is 228492001. The reversal of 228491997 is 799194822.

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

It is not a de Polignac number, because 228491997 - 2¹⁰ = 228490973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228493997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376747 + ... + 377352.

It is an arithmetic number, because the mean of its divisors is an integer number (38459100).

Almost surely, 2^228491997 is an apocalyptic number.

It is an amenable number.

228491997 is a deficient number, since it is larger than the sum of its proper divisors (79180803).

228491997 is a wasteful number, since it uses less digits than its factorization.

228491997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754203.

The product of its digits is 653184, while the sum is 51.

The square root of 228491997 is about 15115.9517398012. The cubic root of 228491997 is about 611.3505836041.

The spelling of 228491997 in words is "two hundred twenty-eight million, four hundred ninety-one thousand, nine hundred ninety-seven".