228643940 has 24 divisors (see below), whose sum is σ = 548745792. Its totient is φ = 78392160.

The previous prime is 228643903. The next prime is 228643963. The reversal of 228643940 is 49346822.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 228643894 and 228643903.

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, 816446 + ... + 816725.

It is an arithmetic number, because the mean of its divisors is an integer number (22864408).

Almost surely, 2^228643940 is an apocalyptic number.

228643940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228643940 is an abundant number, since it is smaller than the sum of its proper divisors (320101852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228643940 is a wasteful number, since it uses less digits than its factorization.

228643940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633187 (or 1633185 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 228643940 is about 15120.9768202984. The cubic root of 228643940 is about 611.4860658972.

The spelling of 228643940 in words is "two hundred twenty-eight million, six hundred forty-three thousand, nine hundred forty".