19949677 has 16 divisors (see below), whose sum is σ = 23353920. Its totient is φ = 16848000.

The previous prime is 19949669. The next prime is 19949689. The reversal of 19949677 is 77694991.

It is a cyclic number.

It is not a de Polignac number, because 19949677 - 2³ = 19949669 is a prime.

It is a super-2 number, since 2×19949677² = 795979224808658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19949627) 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 15 ways as a sum of consecutive naturals, for example, 10177 + ... + 11977.

It is an arithmetic number, because the mean of its divisors is an integer number (1459620).

Almost surely, 2^19949677 is an apocalyptic number.

It is an amenable number.

19949677 is a deficient number, since it is larger than the sum of its proper divisors (3404243).

19949677 is a wasteful number, since it uses less digits than its factorization.

19949677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884.

The product of its digits is 857304, while the sum is 52.

The square root of 19949677 is about 4466.5061289558. The cubic root of 19949677 is about 271.2139077181.

The spelling of 19949677 in words is "nineteen million, nine hundred forty-nine thousand, six hundred seventy-seven".