1780072429 has 2 divisors, whose sum is σ = 1780072430. Its totient is φ = 1780072428.

The previous prime is 1780072417. The next prime is 1780072439. The reversal of 1780072429 is 9242700871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1351665225 + 428407204 = 36765^2 + 20698^2 .

It is a cyclic number.

It is not a de Polignac number, because 1780072429 - 2¹¹ = 1780070381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1780072391 and 1780072400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1780072439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890036214 + 890036215.

It is an arithmetic number, because the mean of its divisors is an integer number (890036215).

Almost surely, 2^1780072429 is an apocalyptic number.

It is an amenable number.

1780072429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780072429 is an equidigital number, since it uses as much as digits as its factorization.

1780072429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1780072429 is about 42190.9045766976. The cubic root of 1780072429 is about 1211.9347117162.

The spelling of 1780072429 in words is "one billion, seven hundred eighty million, seventy-two thousand, four hundred twenty-nine".