1223749844 has 6 divisors (see below), whose sum is σ = 2141562234. Its totient is φ = 611874920.

The previous prime is 1223749843. The next prime is 1223749871. The reversal of 1223749844 is 4489473221.

It can be written as a sum of positive squares in only one way, i.e., 1184185744 + 39564100 = 34412^2 + 6290^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1223749795 and 1223749804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223749843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152968727 + ... + 152968734.

It is an arithmetic number, because the mean of its divisors is an integer number (356927039).

Almost surely, 2^1223749844 is an apocalyptic number.

It is an amenable number.

1223749844 is a deficient number, since it is larger than the sum of its proper divisors (917812390).

1223749844 is a wasteful number, since it uses less digits than its factorization.

1223749844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305937465 (or 305937463 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The square root of 1223749844 is about 34982.1360697142. The cubic root of 1223749844 is about 1069.6233699346.

The spelling of 1223749844 in words is "one billion, two hundred twenty-three million, seven hundred forty-nine thousand, eight hundred forty-four".