1228745439 has 6 divisors (see below), whose sum is σ = 1774854536. Its totient is φ = 819163620.

The previous prime is 1228745411. The next prime is 1228745443. The reversal of 1228745439 is 9345478221.

1228745439 is a `hidden beast` number, since 1 + 22 + 87 + 4 + 543 + 9 = 666.

It is not a de Polignac number, because 1228745439 - 2⁹ = 1228744927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1228745394 and 1228745403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228745449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68263627 + ... + 68263644.

Almost surely, 2^1228745439 is an apocalyptic number.

1228745439 is a deficient number, since it is larger than the sum of its proper divisors (546109097).

1228745439 is a wasteful number, since it uses less digits than its factorization.

1228745439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136527277 (or 136527274 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 1228745439 is about 35053.4654349609. The cubic root of 1228745439 is about 1071.0768670621.

The spelling of 1228745439 in words is "one billion, two hundred twenty-eight million, seven hundred forty-five thousand, four hundred thirty-nine".