19775797 has 8 divisors (see below), whose sum is σ = 20656800. Its totient is φ = 18913104.

The previous prime is 19775779. The next prime is 19775801. The reversal of 19775797 is 79757791.

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 19775797 - 2¹¹ = 19773749 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19775747) 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, 2347 + ... + 6712.

It is an arithmetic number, because the mean of its divisors is an integer number (2582100).

Almost surely, 2^19775797 is an apocalyptic number.

It is an amenable number.

19775797 is a deficient number, since it is larger than the sum of its proper divisors (881003).

19775797 is an equidigital number, since it uses as much as digits as its factorization.

19775797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9155.

The product of its digits is 972405, while the sum is 52.

The square root of 19775797 is about 4446.9986507756. The cubic root of 19775797 is about 270.4236467670.

The spelling of 19775797 in words is "nineteen million, seven hundred seventy-five thousand, seven hundred ninety-seven".