1381881046 has 48 divisors (see below), whose sum is σ = 2603044080. Its totient is φ = 545348160.

The previous prime is 1381881043. The next prime is 1381881047. The reversal of 1381881046 is 6401881831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381881043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 647401 + ... + 649531.

It is an arithmetic number, because the mean of its divisors is an integer number (54230085).

Almost surely, 2^1381881046 is an apocalyptic number.

1381881046 is a deficient number, since it is larger than the sum of its proper divisors (1221163034).

1381881046 is a wasteful number, since it uses less digits than its factorization.

1381881046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669 (or 2662 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 1381881046 is about 37173.6606483677. The cubic root of 1381881046 is about 1113.8419061450.

It can be divided in two parts, 13818 and 81046, that added together give a square (94864 = 308²).

The spelling of 1381881046 in words is "one billion, three hundred eighty-one million, eight hundred eighty-one thousand, forty-six".