1228621943 has 12 divisors (see below), whose sum is σ = 1309359912. Its totient is φ = 1152616320.

The previous prime is 1228621931. The next prime is 1228621987. The reversal of 1228621943 is 3491268221.

It is not a de Polignac number, because 1228621943 - 2¹⁰ = 1228620919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1228621897 and 1228621906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228621913) 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, 84908 + ... + 98318.

It is an arithmetic number, because the mean of its divisors is an integer number (109113326).

Almost surely, 2^1228621943 is an apocalyptic number.

1228621943 is a deficient number, since it is larger than the sum of its proper divisors (80737969).

1228621943 is a wasteful number, since it uses less digits than its factorization.

1228621943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13762 (or 13745 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 1228621943 is about 35051.7038530226. The cubic root of 1228621943 is about 1071.0409827267.

The spelling of 1228621943 in words is "one billion, two hundred twenty-eight million, six hundred twenty-one thousand, nine hundred forty-three".