1385631 has 18 divisors (see below), whose sum is σ = 2169648. Its totient is φ = 851760.

The previous prime is 1385621. The next prime is 1385647. The reversal of 1385631 is 1365831.

It is not a de Polignac number, because 1385631 - 2¹¹ = 1383583 is a prime.

It is a super-2 number, since 2×1385631² = 3839946536322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1385595 and 1385604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385621) 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 17 ways as a sum of consecutive naturals, for example, 1066 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (120536).

2^1385631 is an apocalyptic number.

1385631 is a deficient number, since it is larger than the sum of its proper divisors (784017).

1385631 is a wasteful number, since it uses less digits than its factorization.

1385631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943 (or 927 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1385631 is about 1177.1282852774. The cubic root of 1385631 is about 111.4848525208.

It can be divided in two parts, 1385 and 631, that added together give a triangular number (2016 = T₆₃).

The spelling of 1385631 in words is "one million, three hundred eighty-five thousand, six hundred thirty-one".