1228739643 has 12 divisors (see below), whose sum is σ = 1793144808. Its totient is φ = 810714240.

The previous prime is 1228739641. The next prime is 1228739683. The reversal of 1228739643 is 3469378221.

It is not a de Polignac number, because 1228739643 - 2¹ = 1228739641 is a prime.

It is a super-2 number, since 2×1228739643² = 3019602220559534898, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1228739641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 702873 + ... + 704618.

It is an arithmetic number, because the mean of its divisors is an integer number (149428734).

Almost surely, 2^1228739643 is an apocalyptic number.

1228739643 is a deficient number, since it is larger than the sum of its proper divisors (564405165).

1228739643 is a wasteful number, since it uses less digits than its factorization.

1228739643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407594 (or 1407591 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 1228739643 is about 35053.3827611545. The cubic root of 1228739643 is about 1071.0751829674.

The spelling of 1228739643 in words is "one billion, two hundred twenty-eight million, seven hundred thirty-nine thousand, six hundred forty-three".