1381343766 has 32 divisors (see below), whose sum is σ = 3056299776. Its totient is φ = 412692000.

The previous prime is 1381343749. The next prime is 1381343819. The reversal of 1381343766 is 6673431831.

It is a happy number.

It is a super-2 number, since 2×1381343766² = 3816221199734125512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142705 + ... + 152076.

It is an arithmetic number, because the mean of its divisors is an integer number (95509368).

Almost surely, 2^1381343766 is an apocalyptic number.

1381343766 is an abundant number, since it is smaller than the sum of its proper divisors (1674956010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381343766 is a wasteful number, since it uses less digits than its factorization.

1381343766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294868.

The product of its digits is 217728, while the sum is 42.

The square root of 1381343766 is about 37166.4333236322. The cubic root of 1381343766 is about 1113.6975322722.

The spelling of 1381343766 in words is "one billion, three hundred eighty-one million, three hundred forty-three thousand, seven hundred sixty-six".