993697977 has 4 divisors (see below), whose sum is σ = 1324930640. Its totient is φ = 662465316.

The previous prime is 993697961. The next prime is 993697981. The reversal of 993697977 is 779796399.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 993697977 - 2⁴ = 993697961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993697927) 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, 165616327 + ... + 165616332.

It is an arithmetic number, because the mean of its divisors is an integer number (331232660).

Almost surely, 2^993697977 is an apocalyptic number.

It is an amenable number.

993697977 is a deficient number, since it is larger than the sum of its proper divisors (331232663).

993697977 is a wasteful number, since it uses less digits than its factorization.

993697977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331232662.

The product of its digits is 40507614, while the sum is 66.

The square root of 993697977 is about 31522.9753830440. The cubic root of 993697977 is about 997.8948973189.

The spelling of 993697977 in words is "nine hundred ninety-three million, six hundred ninety-seven thousand, nine hundred seventy-seven".