1439960861 has 2 divisors, whose sum is σ = 1439960862. Its totient is φ = 1439960860.

The previous prime is 1439960813. The next prime is 1439960927. The reversal of 1439960861 is 1680699341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 886252900 + 553707961 = 29770^2 + 23531^2 .

It is an emirp because it is prime and its reverse (1680699341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1439960861 - 2²² = 1435766557 is a prime.

It is a super-2 number, since 2×1439960861² = 4146974562423722642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1439960801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719980430 + 719980431.

It is an arithmetic number, because the mean of its divisors is an integer number (719980431).

Almost surely, 2^1439960861 is an apocalyptic number.

It is an amenable number.

1439960861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439960861 is an equidigital number, since it uses as much as digits as its factorization.

1439960861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1439960861 is about 37946.8162169107. The cubic root of 1439960861 is about 1129.2330036731.

The spelling of 1439960861 in words is "one billion, four hundred thirty-nine million, nine hundred sixty thousand, eight hundred sixty-one".