1381438405 has 4 divisors (see below), whose sum is σ = 1657726092. Its totient is φ = 1105150720.

The previous prime is 1381438381. The next prime is 1381438417. The reversal of 1381438405 is 5048341831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 702992196 + 678446209 = 26514^2 + 26047^2 .

It is not a de Polignac number, because 1381438405 - 2⁷ = 1381438277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138143836 + ... + 138143845.

It is an arithmetic number, because the mean of its divisors is an integer number (414431523).

Almost surely, 2^1381438405 is an apocalyptic number.

It is an amenable number.

1381438405 is a deficient number, since it is larger than the sum of its proper divisors (276287687).

1381438405 is an equidigital number, since it uses as much as digits as its factorization.

1381438405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276287686.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1381438405 is about 37167.7064802229. The cubic root of 1381438405 is about 1113.7229656742.

The spelling of 1381438405 in words is "one billion, three hundred eighty-one million, four hundred thirty-eight thousand, four hundred five".