1381455647 has 32 divisors (see below), whose sum is σ = 1719083520. Its totient is φ = 1092136320.

The previous prime is 1381455641. The next prime is 1381455661. The reversal of 1381455647 is 7465541831.

It is not a de Polignac number, because 1381455647 - 2¹⁰ = 1381454623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1381455598 and 1381455607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381455641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217229 + ... + 223497.

It is an arithmetic number, because the mean of its divisors is an integer number (53721360).

Almost surely, 2^1381455647 is an apocalyptic number.

1381455647 is a deficient number, since it is larger than the sum of its proper divisors (337627873).

1381455647 is a wasteful number, since it uses less digits than its factorization.

1381455647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6383.

The product of its digits is 403200, while the sum is 44.

The square root of 1381455647 is about 37167.9384281668. The cubic root of 1381455647 is about 1113.7275991855.

The spelling of 1381455647 in words is "one billion, three hundred eighty-one million, four hundred fifty-five thousand, six hundred forty-seven".