993432457 has 4 divisors (see below), whose sum is σ = 997770820. Its totient is φ = 989094096.

The previous prime is 993432449. The next prime is 993432469. The reversal of 993432457 is 754234399.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754234399 = 5849 ⋅128951.

It can be written as a sum of positive squares in 2 ways, for example, as 941937481 + 51494976 = 30691^2 + 7176^2 .

It is a cyclic number.

It is not a de Polignac number, because 993432457 - 2³ = 993432449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993432487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2168838 + ... + 2169295.

It is an arithmetic number, because the mean of its divisors is an integer number (249442705).

Almost surely, 2^993432457 is an apocalyptic number.

It is an amenable number.

993432457 is a deficient number, since it is larger than the sum of its proper divisors (4338363).

993432457 is a wasteful number, since it uses less digits than its factorization.

993432457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4338362.

The product of its digits is 816480, while the sum is 46.

The square root of 993432457 is about 31518.7635702925. The cubic root of 993432457 is about 997.8060089235.

The spelling of 993432457 in words is "nine hundred ninety-three million, four hundred thirty-two thousand, four hundred fifty-seven".