1228839279 has 4 divisors (see below), whose sum is σ = 1638452376. Its totient is φ = 819226184.

The previous prime is 1228839263. The next prime is 1228839289. The reversal of 1228839279 is 9729388221.

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 1228839279 - 2⁴ = 1228839263 is a prime.

It is a super-2 number, since 2×1228839279² = 3020091947226479682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228839259) 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, 204806544 + ... + 204806549.

It is an arithmetic number, because the mean of its divisors is an integer number (409613094).

Almost surely, 2^1228839279 is an apocalyptic number.

1228839279 is a deficient number, since it is larger than the sum of its proper divisors (409613097).

1228839279 is an equidigital number, since it uses as much as digits as its factorization.

1228839279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409613096.

The product of its digits is 870912, while the sum is 51.

The square root of 1228839279 is about 35054.8039361226. The cubic root of 1228839279 is about 1071.1041326213.

The spelling of 1228839279 in words is "one billion, two hundred twenty-eight million, eight hundred thirty-nine thousand, two hundred seventy-nine".