1646426879 has 4 divisors (see below), whose sum is σ = 1649166960. Its totient is φ = 1643686800.

The previous prime is 1646426867. The next prime is 1646426891. The reversal of 1646426879 is 9786246461.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1646426867) and next prime (1646426891).

It is a cyclic number.

It is not a de Polignac number, because 1646426879 - 2⁸ = 1646426623 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 1646426879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646416879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369139 + ... + 1370340.

It is an arithmetic number, because the mean of its divisors is an integer number (412291740).

Almost surely, 2^1646426879 is an apocalyptic number.

1646426879 is a deficient number, since it is larger than the sum of its proper divisors (2740081).

1646426879 is an equidigital number, since it uses as much as digits as its factorization.

1646426879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740080.

The product of its digits is 3483648, while the sum is 53.

The square root of 1646426879 is about 40576.1861071245. The cubic root of 1646426879 is about 1180.8121573021.

The spelling of 1646426879 in words is "one billion, six hundred forty-six million, four hundred twenty-six thousand, eight hundred seventy-nine".