228920399 has 8 divisors (see below), whose sum is σ = 236600832. Its totient is φ = 221258520.

The previous prime is 228920389. The next prime is 228920407. The reversal of 228920399 is 993029822.

228920399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 228920399 - 2²⁰ = 227871823 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 (228920309) 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, 23192 + ... + 31554.

It is an arithmetic number, because the mean of its divisors is an integer number (29575104).

Almost surely, 2^228920399 is an apocalyptic number.

228920399 is a deficient number, since it is larger than the sum of its proper divisors (7680433).

228920399 is an equidigital number, since it uses as much as digits as its factorization.

228920399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 228920399 is about 15130.1156307544. The cubic root of 228920399 is about 611.7324209031.

The spelling of 228920399 in words is "two hundred twenty-eight million, nine hundred twenty thousand, three hundred ninety-nine".