228209139 has 18 divisors (see below), whose sum is σ = 350170340. Its totient is φ = 143188416.

The previous prime is 228209129. The next prime is 228209141. The reversal of 228209139 is 931902822.

It is not a de Polignac number, because 228209139 - 2¹⁵ = 228176371 is a prime.

It is a super-2 number, since 2×228209139² = 104158822246242642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228209119) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 41269 + ... + 46470.

Almost surely, 2^228209139 is an apocalyptic number.

228209139 is a deficient number, since it is larger than the sum of its proper divisors (121961201).

228209139 is a wasteful number, since it uses less digits than its factorization.

228209139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87779 (or 87759 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 228209139 is about 15106.5925674852. The cubic root of 228209139 is about 611.0982088871.

The spelling of 228209139 in words is "two hundred twenty-eight million, two hundred nine thousand, one hundred thirty-nine".