1439020477 has 2 divisors, whose sum is σ = 1439020478. Its totient is φ = 1439020476.

The previous prime is 1439020447. The next prime is 1439020481. The reversal of 1439020477 is 7740209341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935197561 + 503822916 = 30581^2 + 22446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1439020477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1439020417) 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 as a sum of consecutive naturals, namely, 719510238 + 719510239.

It is an arithmetic number, because the mean of its divisors is an integer number (719510239).

Almost surely, 2^1439020477 is an apocalyptic number.

It is an amenable number.

1439020477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439020477 is an equidigital number, since it uses as much as digits as its factorization.

1439020477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 1439020477 is about 37934.4233777186. The cubic root of 1439020477 is about 1128.9871303473.

The spelling of 1439020477 in words is "one billion, four hundred thirty-nine million, twenty thousand, four hundred seventy-seven".