1381963405 has 8 divisors (see below), whose sum is σ = 1755906552. Its totient is φ = 1040537088.

The previous prime is 1381963403. The next prime is 1381963411. The reversal of 1381963405 is 5043691831.

It can be written as a sum of positive squares in 4 ways, for example, as 784112004 + 597851401 = 28002^2 + 24451^2 .

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

It is not a de Polignac number, because 1381963405 - 2¹ = 1381963403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381963403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8129112 + ... + 8129281.

It is an arithmetic number, because the mean of its divisors is an integer number (219488319).

Almost surely, 2^1381963405 is an apocalyptic number.

It is an amenable number.

1381963405 is a deficient number, since it is larger than the sum of its proper divisors (373943147).

1381963405 is a wasteful number, since it uses less digits than its factorization.

1381963405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16258415.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1381963405 is about 37174.7683920156. The cubic root of 1381963405 is about 1113.8640337330.

The spelling of 1381963405 in words is "one billion, three hundred eighty-one million, nine hundred sixty-three thousand, four hundred five".