1385431 has 4 divisors (see below), whose sum is σ = 1419264. Its totient is φ = 1351600.

The previous prime is 1385429. The next prime is 1385437. The reversal of 1385431 is 1345831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1345831 = 491 ⋅2741.

It is a cyclic number.

It is not a de Polignac number, because 1385431 - 2¹ = 1385429 is a prime.

It is a super-2 number, since 2×1385431² = 3838838111522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1385396 and 1385405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16855 + ... + 16936.

It is an arithmetic number, because the mean of its divisors is an integer number (354816).

2^1385431 is an apocalyptic number.

1385431 is a deficient number, since it is larger than the sum of its proper divisors (33833).

1385431 is an equidigital number, since it uses as much as digits as its factorization.

1385431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33832.

The product of its digits is 1440, while the sum is 25.

The square root of 1385431 is about 1177.0433297037. The cubic root of 1385431 is about 111.4794884079.

The spelling of 1385431 in words is "one million, three hundred eighty-five thousand, four hundred thirty-one".