993977 has 2 divisors, whose sum is σ = 993978. Its totient is φ = 993976.

The previous prime is 993961. The next prime is 993983. The reversal of 993977 is 779399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 781456 + 212521 = 884^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 993977 - 2⁴ = 993961 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (993907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496988 + 496989.

It is an arithmetic number, because the mean of its divisors is an integer number (496989).

2⁹⁹³⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

993977 is a deficient number, since it is larger than the sum of its proper divisors (1).

993977 is an equidigital number, since it uses as much as digits as its factorization.

993977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107163, while the sum is 44.

The square root of 993977 is about 996.9839517264. The cubic root of 993977 is about 99.7988289066.

The spelling of 993977 in words is "nine hundred ninety-three thousand, nine hundred seventy-seven".