193978465 has 8 divisors (see below), whose sum is σ = 233018280. Its totient is φ = 155020032.

The previous prime is 193978459. The next prime is 193978469. The reversal of 193978465 is 564879391.

It is a happy number.

193978465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 105185536 + 88792929 = 10256^2 + 9423^2 .

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 193978465 - 2²⁷ = 59760737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (193978469) 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, 14970 + ... + 24739.

It is an arithmetic number, because the mean of its divisors is an integer number (29127285).

Almost surely, 2^193978465 is an apocalyptic number.

It is an amenable number.

193978465 is a deficient number, since it is larger than the sum of its proper divisors (39039815).

193978465 is an equidigital number, since it uses as much as digits as its factorization.

193978465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40691.

The product of its digits is 1632960, while the sum is 52.

The square root of 193978465 is about 13927.6151942822. The cubic root of 193978465 is about 578.8746162656.

The spelling of 193978465 in words is "one hundred ninety-three million, nine hundred seventy-eight thousand, four hundred sixty-five".