220400489 has 4 divisors (see below), whose sum is σ = 221389056. Its totient is φ = 219411924.

The previous prime is 220400471. The next prime is 220400539. The reversal of 220400489 is 984004022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984004022 = 2 ⋅492002011.

It is a cyclic number.

It is not a de Polignac number, because 220400489 - 2⁸ = 220400233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220403489) 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, 493949 + ... + 494394.

It is an arithmetic number, because the mean of its divisors is an integer number (55347264).

Almost surely, 2^220400489 is an apocalyptic number.

It is an amenable number.

220400489 is a deficient number, since it is larger than the sum of its proper divisors (988567).

220400489 is an equidigital number, since it uses as much as digits as its factorization.

220400489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988566.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 220400489 is about 14845.8913171288. The cubic root of 220400489 is about 604.0471662142.

The spelling of 220400489 in words is "two hundred twenty million, four hundred thousand, four hundred eighty-nine".