1339706405 has 8 divisors (see below), whose sum is σ = 1609361784. Its totient is φ = 1070622400.

The previous prime is 1339706371. The next prime is 1339706413. The reversal of 1339706405 is 5046079331.

It is a happy number.

It is a Cunningham number, because it is equal to 36602²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 482329444 + 857376961 = 21962^2 + 29281^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1339706405 - 2²⁴ = 1322929189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137666 + ... + 147075.

It is an arithmetic number, because the mean of its divisors is an integer number (201170223).

Almost surely, 2^1339706405 is an apocalyptic number.

It is an amenable number.

1339706405 is a deficient number, since it is larger than the sum of its proper divisors (269655379).

1339706405 is an equidigital number, since it uses as much as digits as its factorization.

1339706405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285687.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 1339706405 is about 36602.0000136605. Note that the first 4 decimals coincide. The cubic root of 1339706405 is about 1102.3932479598.

The spelling of 1339706405 in words is "one billion, three hundred thirty-nine million, seven hundred six thousand, four hundred five".