977993 has 4 divisors (see below), whose sum is σ = 1035540. Its totient is φ = 920448.

The previous prime is 977971. The next prime is 978001. The reversal of 977993 is 399779.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 795664 + 182329 = 892^2 + 427^2 .

It is not a de Polignac number, because 977993 - 2¹² = 973897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (977923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28748 + ... + 28781.

It is an arithmetic number, because the mean of its divisors is an integer number (258885).

2⁹⁷⁷⁹⁹³ is an apocalyptic number.

It is an amenable number.

977993 is a deficient number, since it is larger than the sum of its proper divisors (57547).

977993 is a wasteful number, since it uses less digits than its factorization.

977993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57546.

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

The square root of 977993 is about 988.9352860526. The cubic root of 977993 is about 99.2609853605.

The spelling of 977993 in words is "nine hundred seventy-seven thousand, nine hundred ninety-three".