1646879385 has 16 divisors (see below), whose sum is σ = 2636169984. Its totient is φ = 877948032.

The previous prime is 1646879383. The next prime is 1646879393. The reversal of 1646879385 is 5839786461.

It is not a de Polignac number, because 1646879385 - 2¹ = 1646879383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1646879383) 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 15 ways as a sum of consecutive naturals, for example, 12709 + ... + 58781.

It is an arithmetic number, because the mean of its divisors is an integer number (164760624).

Almost surely, 2^1646879385 is an apocalyptic number.

1646879385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1646879385 is a deficient number, since it is larger than the sum of its proper divisors (989290599).

1646879385 is a wasteful number, since it uses less digits than its factorization.

1646879385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48464.

The product of its digits is 8709120, while the sum is 57.

The square root of 1646879385 is about 40581.7617286386. The cubic root of 1646879385 is about 1180.9203260176.

The spelling of 1646879385 in words is "one billion, six hundred forty-six million, eight hundred seventy-nine thousand, three hundred eighty-five".