1642889479 has 12 divisors (see below), whose sum is σ = 2063796112. Its totient is φ = 1280172960.

The previous prime is 1642889477. The next prime is 1642889497. The reversal of 1642889479 is 9749882461.

It is not a de Polignac number, because 1642889479 - 2¹ = 1642889477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642889477) 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 11 ways as a sum of consecutive naturals, for example, 968982 + ... + 970675.

Almost surely, 2^1642889479 is an apocalyptic number.

1642889479 is a deficient number, since it is larger than the sum of its proper divisors (420906633).

1642889479 is a wasteful number, since it uses less digits than its factorization.

1642889479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939686 (or 1939675 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The square root of 1642889479 is about 40532.5730616747. The cubic root of 1642889479 is about 1179.9658802257.

The spelling of 1642889479 in words is "one billion, six hundred forty-two million, eight hundred eighty-nine thousand, four hundred seventy-nine".