1223638672 has 20 divisors (see below), whose sum is σ = 2377603900. Its totient is φ = 610063488.

The previous prime is 1223638667. The next prime is 1223638723. The reversal of 1223638672 is 2768363221.

It can be written as a sum of positive squares in 2 ways, for example, as 915425536 + 308213136 = 30256^2 + 17556^2 .

It is a super-2 number, since 2×1223638672² = 2994583199227847168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103983 + ... + 115150.

It is an arithmetic number, because the mean of its divisors is an integer number (118880195).

Almost surely, 2^1223638672 is an apocalyptic number.

It is an amenable number.

1223638672 is a deficient number, since it is larger than the sum of its proper divisors (1153965228).

1223638672 is a wasteful number, since it uses less digits than its factorization.

1223638672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219490 (or 219484 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 1223638672 is about 34980.5470511826. The cubic root of 1223638672 is about 1069.5909788456.

The spelling of 1223638672 in words is "one billion, two hundred twenty-three million, six hundred thirty-eight thousand, six hundred seventy-two".