1381831929 has 9 divisors (see below), whose sum is σ = 1996140549. Its totient is φ = 921146940.

The previous prime is 1381831903. The next prime is 1381831931. The reversal of 1381831929 is 9291381831.

The square root of 1381831929 is 37173.

It is a perfect power (a square), and thus also a powerful number.

1381831929 is a `hidden beast` number, since 1 + 381 + 83 + 192 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1381831929 - 2¹¹ = 1381829881 is a prime.

It is a super-2 number, since 2×1381831929² = 3818918960007722082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1381831949) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 105324 + ... + 117714.

Almost surely, 2^1381831929 is an apocalyptic number.

1381831929 is the 37173-rd square number.

1381831929 is the 18587-th centered octagonal number.

It is an amenable number.

1381831929 is a deficient number, since it is larger than the sum of its proper divisors (614308620).

1381831929 is an frugal number, since it uses more digits than its factorization.

1381831929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24788 (or 12394 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The cubic root of 1381831929 is about 1113.8287093456.

The spelling of 1381831929 in words is "one billion, three hundred eighty-one million, eight hundred thirty-one thousand, nine hundred twenty-nine".