646390041 has 8 divisors (see below), whose sum is σ = 940203744. Its totient is φ = 391751520.

The previous prime is 646390027. The next prime is 646390049. The reversal of 646390041 is 140093646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 646390041 - 2²⁵ = 612835609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 19587577 = 646390041 / (6 + 4 + 6 + 3 + 9 + 0 + 0 + 4 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 646389984 and 646390011.

It is not an unprimeable number, because it can be changed into a prime (646390049) 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, 9793756 + ... + 9793821.

It is an arithmetic number, because the mean of its divisors is an integer number (117525468).

Almost surely, 2^646390041 is an apocalyptic number.

It is an amenable number.

646390041 is a deficient number, since it is larger than the sum of its proper divisors (293813703).

646390041 is a wasteful number, since it uses less digits than its factorization.

646390041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19587591.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 646390041 is about 25424.2018753785. The cubic root of 646390041 is about 864.6324927060.

The spelling of 646390041 in words is "six hundred forty-six million, three hundred ninety thousand, forty-one".