363994721 has 2 divisors, whose sum is σ = 363994722. Its totient is φ = 363994720.

The previous prime is 363994669. The next prime is 363994739. The reversal of 363994721 is 127499363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 326344225 + 37650496 = 18065^2 + 6136^2 .

It is a cyclic number.

It is not a de Polignac number, because 363994721 - 2²² = 359800417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (363994751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181997360 + 181997361.

It is an arithmetic number, because the mean of its divisors is an integer number (181997361).

Almost surely, 2^363994721 is an apocalyptic number.

It is an amenable number.

363994721 is a deficient number, since it is larger than the sum of its proper divisors (1).

363994721 is an equidigital number, since it uses as much as digits as its factorization.

363994721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 363994721 is about 19078.6456804460. The cubic root of 363994721 is about 714.0002465037. Note that the first 3 decimals are identical.

The spelling of 363994721 in words is "three hundred sixty-three million, nine hundred ninety-four thousand, seven hundred twenty-one".