1219972859 has 4 divisors (see below), whose sum is σ = 1394254704. Its totient is φ = 1045691016.

The previous prime is 1219972847. The next prime is 1219972867. The reversal of 1219972859 is 9582799121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1219972859 - 2¹⁶ = 1219907323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1219972859.

It is not an unprimeable number, because it can be changed into a prime (1219972759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87140912 + ... + 87140925.

It is an arithmetic number, because the mean of its divisors is an integer number (348563676).

Almost surely, 2^1219972859 is an apocalyptic number.

1219972859 is a deficient number, since it is larger than the sum of its proper divisors (174281845).

1219972859 is an equidigital number, since it uses as much as digits as its factorization.

1219972859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174281844.

The product of its digits is 816480, while the sum is 53.

The square root of 1219972859 is about 34928.1098687003. The cubic root of 1219972859 is about 1068.5218063291.

It can be divided in two parts, 12199 and 72859, that added together give a palindrome (85058).

The spelling of 1219972859 in words is "one billion, two hundred nineteen million, nine hundred seventy-two thousand, eight hundred fifty-nine".