1220366399 has 4 divisors (see below), whose sum is σ = 1394704464. Its totient is φ = 1046028336.

The previous prime is 1220366377. The next prime is 1220366461. The reversal of 1220366399 is 9936630221.

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 1220366399 - 2¹² = 1220362303 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 (1220366339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87169022 + ... + 87169035.

It is an arithmetic number, because the mean of its divisors is an integer number (348676116).

Almost surely, 2^1220366399 is an apocalyptic number.

1220366399 is a deficient number, since it is larger than the sum of its proper divisors (174338065).

1220366399 is an equidigital number, since it uses as much as digits as its factorization.

1220366399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174338064.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 1220366399 is about 34933.7429858296. The cubic root of 1220366399 is about 1068.6366889023.

The spelling of 1220366399 in words is "one billion, two hundred twenty million, three hundred sixty-six thousand, three hundred ninety-nine".