1780480949 has 4 divisors (see below), whose sum is σ = 1917441036. Its totient is φ = 1643520864.

The previous prime is 1780480921. The next prime is 1780480967. The reversal of 1780480949 is 9490840871.

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 519520849 + 1260960100 = 22793^2 + 35510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1780480949 is a prime.

It is a super-2 number, since 2×1780480949² = 6340224819503881202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1780480897 and 1780480906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780480979) 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, 68480024 + ... + 68480049.

It is an arithmetic number, because the mean of its divisors is an integer number (479360259).

Almost surely, 2^1780480949 is an apocalyptic number.

It is an amenable number.

1780480949 is a deficient number, since it is larger than the sum of its proper divisors (136960087).

1780480949 is a wasteful number, since it uses less digits than its factorization.

1780480949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136960086.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 1780480949 is about 42195.7456267809. The cubic root of 1780480949 is about 1212.0274161273.

The spelling of 1780480949 in words is "one billion, seven hundred eighty million, four hundred eighty thousand, nine hundred forty-nine".