1226820673 has 8 divisors (see below), whose sum is σ = 1321463528. Its totient is φ = 1132216704.

The previous prime is 1226820653. The next prime is 1226820697. The reversal of 1226820673 is 3760286221.

It can be written as a sum of positive squares in 4 ways, for example, as 766846864 + 459973809 = 27692^2 + 21447^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1226820673 - 2¹³ = 1226812481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226820643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120061 + ... + 129877.

It is an arithmetic number, because the mean of its divisors is an integer number (165182941).

Almost surely, 2^1226820673 is an apocalyptic number.

1226820673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1226820673 is a deficient number, since it is larger than the sum of its proper divisors (94642855).

1226820673 is an equidigital number, since it uses as much as digits as its factorization.

1226820673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19443.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 1226820673 is about 35025.9999571747. Note that the first 4 decimals coincide. The cubic root of 1226820673 is about 1070.5173126695.

The spelling of 1226820673 in words is "one billion, two hundred twenty-six million, eight hundred twenty thousand, six hundred seventy-three".