993760421 has 2 divisors, whose sum is σ = 993760422. Its totient is φ = 993760420.

The previous prime is 993760403. The next prime is 993760451. The reversal of 993760421 is 124067399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 842740900 + 151019521 = 29030^2 + 12289^2 .

It is a cyclic number.

It is not a de Polignac number, because 993760421 - 2⁶ = 993760357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993760451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496880210 + 496880211.

It is an arithmetic number, because the mean of its divisors is an integer number (496880211).

Almost surely, 2^993760421 is an apocalyptic number.

It is an amenable number.

993760421 is a deficient number, since it is larger than the sum of its proper divisors (1).

993760421 is an equidigital number, since it uses as much as digits as its factorization.

993760421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 993760421 is about 31523.9658196744. The cubic root of 993760421 is about 997.9157994593.

The spelling of 993760421 in words is "nine hundred ninety-three million, seven hundred sixty thousand, four hundred twenty-one".