1220550397 has 8 divisors (see below), whose sum is σ = 1333268352. Its totient is φ = 1108125600.

The previous prime is 1220550349. The next prime is 1220550427. The reversal of 1220550397 is 7930550221.

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 1220550397 - 2¹¹ = 1220548349 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 (1220550497) 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, 64533 + ... + 81274.

It is an arithmetic number, because the mean of its divisors is an integer number (166658544).

Almost surely, 2^1220550397 is an apocalyptic number.

It is an amenable number.

1220550397 is a deficient number, since it is larger than the sum of its proper divisors (112717955).

1220550397 is a wasteful number, since it uses less digits than its factorization.

1220550397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146579.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 1220550397 is about 34936.3764148488. The cubic root of 1220550397 is about 1068.6903933014.

The spelling of 1220550397 in words is "one billion, two hundred twenty million, five hundred fifty thousand, three hundred ninety-seven".