228140639 has 2 divisors, whose sum is σ = 228140640. Its totient is φ = 228140638.

The previous prime is 228140623. The next prime is 228140659. The reversal of 228140639 is 936041822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228140639 - 2⁴ = 228140623 is a prime.

It is equal to p_12545909 and since 228140639 and 12545909 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 228140599 and 228140608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228140659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114070319 + 114070320.

It is an arithmetic number, because the mean of its divisors is an integer number (114070320).

Almost surely, 2^228140639 is an apocalyptic number.

228140639 is a deficient number, since it is larger than the sum of its proper divisors (1).

228140639 is an equidigital number, since it uses as much as digits as its factorization.

228140639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 228140639 is about 15104.3251752602. The cubic root of 228140639 is about 611.0370596908.

The spelling of 228140639 in words is "two hundred twenty-eight million, one hundred forty thousand, six hundred thirty-nine".