1391863 has 6 divisors (see below), whose sum is σ = 1530032. Its totient is φ = 1265220.

The previous prime is 1391861. The next prime is 1391893. The reversal of 1391863 is 3681931.

It is not a de Polignac number, because 1391863 - 2¹ = 1391861 is a prime.

It is a super-2 number, since 2×1391863² = 3874565221538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5631 + ... + 5872.

2^1391863 is an apocalyptic number.

1391863 is a deficient number, since it is larger than the sum of its proper divisors (138169).

1391863 is a wasteful number, since it uses less digits than its factorization.

1391863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11525 (or 11514 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 1391863 is about 1179.7724356841. The cubic root of 1391863 is about 111.6517402885.

It can be divided in two parts, 139 and 1863, that added together give a palindrome (2002).

The spelling of 1391863 in words is "one million, three hundred ninety-one thousand, eight hundred sixty-three".