220723397 has 2 divisors, whose sum is σ = 220723398. Its totient is φ = 220723396.

The previous prime is 220723381. The next prime is 220723409. The reversal of 220723397 is 793327022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219069601 + 1653796 = 14801^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 220723397 - 2⁴ = 220723381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220723357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110361698 + 110361699.

It is an arithmetic number, because the mean of its divisors is an integer number (110361699).

Almost surely, 2^220723397 is an apocalyptic number.

It is an amenable number.

220723397 is a deficient number, since it is larger than the sum of its proper divisors (1).

220723397 is an equidigital number, since it uses as much as digits as its factorization.

220723397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 220723397 is about 14856.7626688993. The cubic root of 220723397 is about 604.3420180756.

The spelling of 220723397 in words is "two hundred twenty million, seven hundred twenty-three thousand, three hundred ninety-seven".