1642321779 has 12 divisors (see below), whose sum is σ = 2547274824. Its totient is φ = 938469504.

The previous prime is 1642321763. The next prime is 1642321787. The reversal of 1642321779 is 9771232461.

It is not a de Polignac number, because 1642321779 - 2⁴ = 1642321763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1642321779.

It is not an unprimeable number, because it can be changed into a prime (1642323779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5585982 + ... + 5586275.

It is an arithmetic number, because the mean of its divisors is an integer number (212272902).

Almost surely, 2^1642321779 is an apocalyptic number.

1642321779 is a deficient number, since it is larger than the sum of its proper divisors (904953045).

1642321779 is a wasteful number, since it uses less digits than its factorization.

1642321779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11172274 (or 11172267 counting only the distinct ones).

The product of its digits is 127008, while the sum is 42.

The square root of 1642321779 is about 40525.5694469553. The cubic root of 1642321779 is about 1179.8299522746.

The spelling of 1642321779 in words is "one billion, six hundred forty-two million, three hundred twenty-one thousand, seven hundred seventy-nine".