1229993391 has 16 divisors (see below), whose sum is σ = 1795696128. Its totient is φ = 742694400.

The previous prime is 1229993389. The next prime is 1229993407. The reversal of 1229993391 is 1933999221.

It is not a de Polignac number, because 1229993391 - 2¹ = 1229993389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1229993391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229993321) 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, 59826 + ... + 77711.

It is an arithmetic number, because the mean of its divisors is an integer number (112231008).

Almost surely, 2^1229993391 is an apocalyptic number.

1229993391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1229993391 is a deficient number, since it is larger than the sum of its proper divisors (565702737).

1229993391 is a wasteful number, since it uses less digits than its factorization.

1229993391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137822.

The product of its digits is 236196, while the sum is 48.

The square root of 1229993391 is about 35071.2616111825. The cubic root of 1229993391 is about 1071.4393506750.

The spelling of 1229993391 in words is "one billion, two hundred twenty-nine million, nine hundred ninety-three thousand, three hundred ninety-one".