1229689139 has 16 divisors (see below), whose sum is σ = 1480300800. Its totient is φ = 997886304.

The previous prime is 1229689099. The next prime is 1229689157. The reversal of 1229689139 is 9319869221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1229689139 - 2¹² = 1229685043 is a prime.

It is a super-2 number, since 2×1229689139² = 3024270757149122642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1229689159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375692 + ... + 378950.

It is an arithmetic number, because the mean of its divisors is an integer number (92518800).

Almost surely, 2^1229689139 is an apocalyptic number.

1229689139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1229689139 is a deficient number, since it is larger than the sum of its proper divisors (250611661).

1229689139 is a wasteful number, since it uses less digits than its factorization.

1229689139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6122.

The product of its digits is 419904, while the sum is 50.

The square root of 1229689139 is about 35066.9237173722. The cubic root of 1229689139 is about 1071.3509994014.

The spelling of 1229689139 in words is "one billion, two hundred twenty-nine million, six hundred eighty-nine thousand, one hundred thirty-nine".