646145393 has 8 divisors (see below), whose sum is σ = 668838912. Its totient is φ = 623727216.

The previous prime is 646145377. The next prime is 646145441. The reversal of 646145393 is 393541646.

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 646145393 - 2⁴ = 646145377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 646145393.

It is not an unprimeable number, because it can be changed into a prime (646145323) 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, 64055 + ... + 73452.

It is an arithmetic number, because the mean of its divisors is an integer number (83604864).

Almost surely, 2^646145393 is an apocalyptic number.

It is an amenable number.

646145393 is a deficient number, since it is larger than the sum of its proper divisors (22693519).

646145393 is a wasteful number, since it uses less digits than its factorization.

646145393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137671.

The product of its digits is 233280, while the sum is 41.

The square root of 646145393 is about 25419.3900988989. The cubic root of 646145393 is about 864.5233958814.

It can be divided in two parts, 64614 and 5393, that added together give a palindrome (70007).

The spelling of 646145393 in words is "six hundred forty-six million, one hundred forty-five thousand, three hundred ninety-three".