228439487 has 4 divisors (see below), whose sum is σ = 232749720. Its totient is φ = 224129256.

The previous prime is 228439459. The next prime is 228439507. The reversal of 228439487 is 784934822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 228439487 - 2¹² = 228435391 is a prime.

It is a super-3 number, since 3×228439487³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228439457) 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, 2155037 + ... + 2155142.

It is an arithmetic number, because the mean of its divisors is an integer number (58187430).

Almost surely, 2^228439487 is an apocalyptic number.

228439487 is a deficient number, since it is larger than the sum of its proper divisors (4310233).

228439487 is an equidigital number, since it uses as much as digits as its factorization.

228439487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4310232.

The product of its digits is 774144, while the sum is 47.

The square root of 228439487 is about 15114.2147331577. The cubic root of 228439487 is about 611.3037482969.

The spelling of 228439487 in words is "two hundred twenty-eight million, four hundred thirty-nine thousand, four hundred eighty-seven".