1478939989 has 2 divisors, whose sum is σ = 1478939990. Its totient is φ = 1478939988.

The previous prime is 1478939933. The next prime is 1478940049. The reversal of 1478939989 is 9899398741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 772284100 + 706655889 = 27790^2 + 26583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1478939989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1478939389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 739469994 + 739469995.

It is an arithmetic number, because the mean of its divisors is an integer number (739469995).

Almost surely, 2^1478939989 is an apocalyptic number.

It is an amenable number.

1478939989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1478939989 is an equidigital number, since it uses as much as digits as its factorization.

1478939989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35271936, while the sum is 67.

The square root of 1478939989 is about 38456.9888186790. The cubic root of 1478939989 is about 1139.3317076732.

The spelling of 1478939989 in words is "one billion, four hundred seventy-eight million, nine hundred thirty-nine thousand, nine hundred eighty-nine".