1418328721 has 2 divisors, whose sum is σ = 1418328722. Its totient is φ = 1418328720.

The previous prime is 1418328713. The next prime is 1418328799. The reversal of 1418328721 is 1278238141.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090320400 + 328008321 = 33020^2 + 18111^2 .

It is an emirp because it is prime and its reverse (1278238141) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1418328721 - 2³ = 1418328713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1418338721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 709164360 + 709164361.

It is an arithmetic number, because the mean of its divisors is an integer number (709164361).

Almost surely, 2^1418328721 is an apocalyptic number.

It is an amenable number.

1418328721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1418328721 is an equidigital number, since it uses as much as digits as its factorization.

1418328721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 37.

The square root of 1418328721 is about 37660.7052642406. The cubic root of 1418328721 is about 1123.5497285150.

The spelling of 1418328721 in words is "one billion, four hundred eighteen million, three hundred twenty-eight thousand, seven hundred twenty-one".