1226287639 has 8 divisors (see below), whose sum is σ = 1309914720. Its totient is φ = 1143937536.

The previous prime is 1226287627. The next prime is 1226287661. The reversal of 1226287639 is 9367826221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1226287639 - 2¹⁵ = 1226254871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226287339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317259 + ... + 321100.

It is an arithmetic number, because the mean of its divisors is an integer number (163739340).

Almost surely, 2^1226287639 is an apocalyptic number.

1226287639 is a deficient number, since it is larger than the sum of its proper divisors (83627081).

1226287639 is a wasteful number, since it uses less digits than its factorization.

1226287639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638489.

The product of its digits is 435456, while the sum is 46.

The square root of 1226287639 is about 35018.3900115354. The cubic root of 1226287639 is about 1070.3622493148.

The spelling of 1226287639 in words is "one billion, two hundred twenty-six million, two hundred eighty-seven thousand, six hundred thirty-nine".