220400399 has 4 divisors (see below), whose sum is σ = 232000440. Its totient is φ = 208800360.

The previous prime is 220400371. The next prime is 220400417. The reversal of 220400399 is 993004022.

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 220400399 - 2⁸ = 220400143 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 (220400309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5799992 + ... + 5800029.

It is an arithmetic number, because the mean of its divisors is an integer number (58000110).

Almost surely, 2^220400399 is an apocalyptic number.

220400399 is a deficient number, since it is larger than the sum of its proper divisors (11600041).

220400399 is a wasteful number, since it uses less digits than its factorization.

220400399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11600040.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 220400399 is about 14845.8882859868. Note that the first 3 decimals coincide. The cubic root of 220400399 is about 604.0470839938.

The spelling of 220400399 in words is "two hundred twenty million, four hundred thousand, three hundred ninety-nine".