19977193 has 8 divisors (see below), whose sum is σ = 21348360. Its totient is φ = 18627840.

The previous prime is 19977169. The next prime is 19977197. The reversal of 19977193 is 39177991.

It can be written as a sum of positive squares in 4 ways, for example, as 5139289 + 14837904 = 2267^2 + 3852^2 .

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 19977193 - 2⁵ = 19977161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19977197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3538 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (2668545).

Almost surely, 2^19977193 is an apocalyptic number.

It is an amenable number.

19977193 is a deficient number, since it is larger than the sum of its proper divisors (1371167).

19977193 is a wasteful number, since it uses less digits than its factorization.

19977193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10907.

The product of its digits is 107163, while the sum is 46.

The square root of 19977193 is about 4469.5853275220. The cubic root of 19977193 is about 271.3385428767.

The spelling of 19977193 in words is "nineteen million, nine hundred seventy-seven thousand, one hundred ninety-three".