228138405 has 32 divisors (see below), whose sum is σ = 400025088. Its totient is φ = 110107200.

The previous prime is 228138401. The next prime is 228138413. The reversal of 228138405 is 504831822.

It is not a de Polignac number, because 228138405 - 2² = 228138401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228138401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34410 + ... + 40500.

It is an arithmetic number, because the mean of its divisors is an integer number (12500784).

Almost surely, 2^228138405 is an apocalyptic number.

It is an amenable number.

228138405 is a deficient number, since it is larger than the sum of its proper divisors (171886683).

228138405 is a wasteful number, since it uses less digits than its factorization.

228138405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6337.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 228138405 is about 15104.2512227518. The cubic root of 228138405 is about 611.0350652175.

The spelling of 228138405 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, four hundred five".