993408425 has 18 divisors (see below), whose sum is σ = 1244826762. Its totient is φ = 786365440.

The previous prime is 993408421. The next prime is 993408457. The reversal of 993408425 is 524804399.

It can be written as a sum of positive squares in 9 ways, for example, as 456420496 + 536987929 = 21364^2 + 23173^2 .

It is not a de Polignac number, because 993408425 - 2² = 993408421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (993408421) 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 in 17 ways as a sum of consecutive naturals, for example, 1674929 + ... + 1675521.

Almost surely, 2^993408425 is an apocalyptic number.

It is an amenable number.

993408425 is a deficient number, since it is larger than the sum of its proper divisors (251418337).

993408425 is an equidigital number, since it uses as much as digits as its factorization.

993408425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 993408425 is about 31518.3823347582. The cubic root of 993408425 is about 997.7979629253.

The spelling of 993408425 in words is "nine hundred ninety-three million, four hundred eight thousand, four hundred twenty-five".