1229399687 has 2 divisors, whose sum is σ = 1229399688. Its totient is φ = 1229399686.

The previous prime is 1229399663. The next prime is 1229399701. The reversal of 1229399687 is 7869939221.

It is a strong prime.

It is an emirp because it is prime and its reverse (7869939221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1229399687 - 2¹⁴ = 1229383303 is a prime.

It is a super-2 number, since 2×1229399687² = 3022847180791395938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229399287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614699843 + 614699844.

It is an arithmetic number, because the mean of its divisors is an integer number (614699844).

Almost surely, 2^1229399687 is an apocalyptic number.

1229399687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229399687 is an equidigital number, since it uses as much as digits as its factorization.

1229399687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 56.

The square root of 1229399687 is about 35062.7963374287. The cubic root of 1229399687 is about 1071.2669323490.

The spelling of 1229399687 in words is "one billion, two hundred twenty-nine million, three hundred ninety-nine thousand, six hundred eighty-seven".