1220444397 has 12 divisors (see below), whose sum is σ = 1781039260. Its totient is φ = 805241088.

The previous prime is 1220444383. The next prime is 1220444413. The reversal of 1220444397 is 7934440221.

1220444397 is a `hidden beast` number, since 1 + 2 + 204 + 443 + 9 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 854334441 + 366109956 = 29229^2 + 19134^2 .

It is not a de Polignac number, because 1220444397 - 2¹⁰ = 1220443373 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 (1220444317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 698122 + ... + 699867.

Almost surely, 2^1220444397 is an apocalyptic number.

It is an amenable number.

1220444397 is a deficient number, since it is larger than the sum of its proper divisors (560594863).

1220444397 is a wasteful number, since it uses less digits than its factorization.

1220444397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398092 (or 1398089 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 1220444397 is about 34934.8593384888. The cubic root of 1220444397 is about 1068.6594552204.

The spelling of 1220444397 in words is "one billion, two hundred twenty million, four hundred forty-four thousand, three hundred ninety-seven".