220919397 has 4 divisors (see below), whose sum is σ = 294559200. Its totient is φ = 147279596.

The previous prime is 220919383. The next prime is 220919399. The reversal of 220919397 is 793919022.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 220919397 - 2⁸ = 220919141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220919399) 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, 36819897 + ... + 36819902.

It is an arithmetic number, because the mean of its divisors is an integer number (73639800).

Almost surely, 2^220919397 is an apocalyptic number.

It is an amenable number.

220919397 is a deficient number, since it is larger than the sum of its proper divisors (73639803).

220919397 is an equidigital number, since it uses as much as digits as its factorization.

220919397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73639802.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 220919397 is about 14863.3575278266. The cubic root of 220919397 is about 604.5208482213.

The spelling of 220919397 in words is "two hundred twenty million, nine hundred nineteen thousand, three hundred ninety-seven".