1391864 has 16 divisors (see below), whose sum is σ = 2747400. Its totient is φ = 659232.

The previous prime is 1391861. The next prime is 1391893. The reversal of 1391864 is 4681931.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1391864.

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 3 ways as a sum of consecutive naturals, for example, 4427 + ... + 4730.

2^1391864 is an apocalyptic number.

It is an amenable number.

1391864 is a deficient number, since it is larger than the sum of its proper divisors (1355536).

1391864 is a wasteful number, since it uses less digits than its factorization.

1391864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9182 (or 9178 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 1391864 is about 1179.7728594946. The cubic root of 1391864 is about 111.6517670277.

The spelling of 1391864 in words is "one million, three hundred ninety-one thousand, eight hundred sixty-four".