646838413 has 8 divisors (see below), whose sum is σ = 733258400. Its totient is φ = 565656048.

The previous prime is 646838411. The next prime is 646838429. The reversal of 646838413 is 314838646.

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 646838413 - 2¹ = 646838411 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 646838413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646838411) 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, 1309143 + ... + 1309636.

It is an arithmetic number, because the mean of its divisors is an integer number (91657300).

Almost surely, 2^646838413 is an apocalyptic number.

It is an amenable number.

646838413 is a deficient number, since it is larger than the sum of its proper divisors (86419987).

646838413 is a wasteful number, since it uses less digits than its factorization.

646838413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618811.

The product of its digits is 331776, while the sum is 43.

The square root of 646838413 is about 25433.0181653692. The cubic root of 646838413 is about 864.8323655236.

The spelling of 646838413 in words is "six hundred forty-six million, eight hundred thirty-eight thousand, four hundred thirteen".