1223929639 has 2 divisors, whose sum is σ = 1223929640. Its totient is φ = 1223929638.

The previous prime is 1223929591. The next prime is 1223929649. The reversal of 1223929639 is 9369293221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1223929639 - 2¹¹ = 1223927591 is a prime.

It is a super-2 number, since 2×1223929639² = 2996007522445340642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223929649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611964819 + 611964820.

It is an arithmetic number, because the mean of its divisors is an integer number (611964820).

Almost surely, 2^1223929639 is an apocalyptic number.

1223929639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223929639 is an equidigital number, since it uses as much as digits as its factorization.

1223929639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 46.

The square root of 1223929639 is about 34984.7057869578. The cubic root of 1223929639 is about 1069.6757508786.

The spelling of 1223929639 in words is "one billion, two hundred twenty-three million, nine hundred twenty-nine thousand, six hundred thirty-nine".