19988077 has 8 divisors (see below), whose sum is σ = 20656064. Its totient is φ = 19329408.

The previous prime is 19988041. The next prime is 19988083. The reversal of 19988077 is 77088991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19988077 - 2⁷ = 19987949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19988077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19988377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2173 + ... + 6685.

It is an arithmetic number, because the mean of its divisors is an integer number (2582008).

Almost surely, 2^19988077 is an apocalyptic number.

It is an amenable number.

19988077 is a deficient number, since it is larger than the sum of its proper divisors (667987).

19988077 is a wasteful number, since it uses less digits than its factorization.

19988077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4659.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 19988077 is about 4470.8027243438. The cubic root of 19988077 is about 271.3878109351.

The spelling of 19988077 in words is "nineteen million, nine hundred eighty-eight thousand, seventy-seven".