1779984949 has 4 divisors (see below), whose sum is σ = 1884689964. Its totient is φ = 1675279936.

The previous prime is 1779984931. The next prime is 1779984953. The reversal of 1779984949 is 9494899771.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1486102500 + 293882449 = 38550^2 + 17143^2 .

It is a cyclic number.

It is not a de Polignac number, because 1779984949 - 2⁷ = 1779984821 is a prime.

It is a super-3 number, since 3×1779984949³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1779984919) 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, 52352482 + ... + 52352515.

It is an arithmetic number, because the mean of its divisors is an integer number (471172491).

Almost surely, 2^1779984949 is an apocalyptic number.

It is an amenable number.

1779984949 is a deficient number, since it is larger than the sum of its proper divisors (104705015).

1779984949 is a wasteful number, since it uses less digits than its factorization.

1779984949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104705014.

The product of its digits is 41150592, while the sum is 67.

The square root of 1779984949 is about 42189.8678476243. The cubic root of 1779984949 is about 1211.9148582571.

The spelling of 1779984949 in words is "one billion, seven hundred seventy-nine million, nine hundred eighty-four thousand, nine hundred forty-nine".