18696977 has 12 divisors (see below), whose sum is σ = 20367900. Its totient is φ = 17155008.

The previous prime is 18696949. The next prime is 18696983. The reversal of 18696977 is 77969681.

It is a happy number.

It is a Cunningham number, because it is equal to 4324²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 4977361 + 13719616 = 2231^2 + 3704^2 .

It is not a de Polignac number, because 18696977 - 2⁶ = 18696913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18696917) 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 11 ways as a sum of consecutive naturals, for example, 53399 + ... + 53747.

It is an arithmetic number, because the mean of its divisors is an integer number (1697325).

Almost surely, 2^18696977 is an apocalyptic number.

It is an amenable number.

18696977 is a deficient number, since it is larger than the sum of its proper divisors (1670923).

18696977 is a wasteful number, since it uses less digits than its factorization.

18696977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 679 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 53.

The square root of 18696977 is about 4324.0001156337. Note that the first 3 decimals coincide. The cubic root of 18696977 is about 265.4139821099.

The spelling of 18696977 in words is "eighteen million, six hundred ninety-six thousand, nine hundred seventy-seven".