1228972399 has 4 divisors (see below), whose sum is σ = 1229390136. Its totient is φ = 1228554664.

The previous prime is 1228972351. The next prime is 1228972453. The reversal of 1228972399 is 9932798221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9932798221 = 93097 ⋅106693.

It is a cyclic number.

It is not a de Polignac number, because 1228972399 - 2¹⁵ = 1228939631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228972319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204424 + ... + 210349.

It is an arithmetic number, because the mean of its divisors is an integer number (307347534).

Almost surely, 2^1228972399 is an apocalyptic number.

1228972399 is a deficient number, since it is larger than the sum of its proper divisors (417737).

1228972399 is an equidigital number, since it uses as much as digits as its factorization.

1228972399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417736.

The product of its digits is 979776, while the sum is 52.

The square root of 1228972399 is about 35056.7026258888. The cubic root of 1228972399 is about 1071.1428087488.

The spelling of 1228972399 in words is "one billion, two hundred twenty-eight million, nine hundred seventy-two thousand, three hundred ninety-nine".