1229479639 has 2 divisors, whose sum is σ = 1229479640. Its totient is φ = 1229479638.

The previous prime is 1229479591. The next prime is 1229479723. The reversal of 1229479639 is 9369749221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1229479639 - 2¹⁷ = 1229348567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229479739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614739819 + 614739820.

It is an arithmetic number, because the mean of its divisors is an integer number (614739820).

Almost surely, 2^1229479639 is an apocalyptic number.

1229479639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229479639 is an equidigital number, since it uses as much as digits as its factorization.

1229479639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 52.

The square root of 1229479639 is about 35063.9364447291. The cubic root of 1229479639 is about 1071.2901545438.

The spelling of 1229479639 in words is "one billion, two hundred twenty-nine million, four hundred seventy-nine thousand, six hundred thirty-nine".