1381831 has 4 divisors (see below), whose sum is σ = 1507464. Its totient is φ = 1256200.

The previous prime is 1381819. The next prime is 1381837.

1381831 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1381831 - 2¹³ = 1373639 is a prime.

It is a super-2 number, since 2×1381831² = 3818913825122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1381796 and 1381805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62800 + ... + 62821.

It is an arithmetic number, because the mean of its divisors is an integer number (376866).

2^1381831 is an apocalyptic number.

1381831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1381831 is a deficient number, since it is larger than the sum of its proper divisors (125633).

1381831 is a wasteful number, since it uses less digits than its factorization.

1381831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125632.

The product of its digits is 576, while the sum is 25.

The square root of 1381831 is about 1175.5130794679. The cubic root of 1381831 is about 111.3828459738.

The spelling of 1381831 in words is "one million, three hundred eighty-one thousand, eight hundred thirty-one".