1220399699 has 8 divisors (see below), whose sum is σ = 1230325200. Its totient is φ = 1210489216.

The previous prime is 1220399681. The next prime is 1220399701. The reversal of 1220399699 is 9969930221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220399699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220399639) 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, 205727 + ... + 211575.

It is an arithmetic number, because the mean of its divisors is an integer number (153790650).

Almost surely, 2^1220399699 is an apocalyptic number.

1220399699 is a deficient number, since it is larger than the sum of its proper divisors (9925501).

1220399699 is a wasteful number, since it uses less digits than its factorization.

1220399699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7509.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 1220399699 is about 34934.2195991266. The cubic root of 1220399699 is about 1068.6464087368.

The spelling of 1220399699 in words is "one billion, two hundred twenty million, three hundred ninety-nine thousand, six hundred ninety-nine".