1440728477 has 2 divisors, whose sum is σ = 1440728478. Its totient is φ = 1440728476.

The previous prime is 1440728453. The next prime is 1440728489. The reversal of 1440728477 is 7748270441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 810768676 + 629959801 = 28474^2 + 25099^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440728477 - 2⁸ = 1440728221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440728077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720364238 + 720364239.

It is an arithmetic number, because the mean of its divisors is an integer number (720364239).

Almost surely, 2^1440728477 is an apocalyptic number.

It is an amenable number.

1440728477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440728477 is an equidigital number, since it uses as much as digits as its factorization.

1440728477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 351232, while the sum is 44.

The square root of 1440728477 is about 37956.9292356481. The cubic root of 1440728477 is about 1129.4336256396.

The spelling of 1440728477 in words is "one billion, four hundred forty million, seven hundred twenty-eight thousand, four hundred seventy-seven".