1223931979 has 8 divisors (see below), whose sum is σ = 1270715760. Its totient is φ = 1177453536.

The previous prime is 1223931971. The next prime is 1223932013. The reversal of 1223931979 is 9791393221.

It is a happy number.

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 1223931979 - 2³ = 1223931971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223931971) 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, 68149 + ... + 84214.

It is an arithmetic number, because the mean of its divisors is an integer number (158839470).

Almost surely, 2^1223931979 is an apocalyptic number.

1223931979 is a deficient number, since it is larger than the sum of its proper divisors (46783781).

1223931979 is a wasteful number, since it uses less digits than its factorization.

1223931979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152669.

The product of its digits is 183708, while the sum is 46.

The square root of 1223931979 is about 34984.7392301272. The cubic root of 1223931979 is about 1069.6764325735.

The spelling of 1223931979 in words is "one billion, two hundred twenty-three million, nine hundred thirty-one thousand, nine hundred seventy-nine".