1391388 has 24 divisors (see below), whose sum is σ = 3316992. Its totient is φ = 453744.

The previous prime is 1391381. The next prime is 1391393. The reversal of 1391388 is 8831931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391381) 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 7 ways as a sum of consecutive naturals, for example, 670 + ... + 1797.

It is an arithmetic number, because the mean of its divisors is an integer number (138208).

2^1391388 is an apocalyptic number.

It is an amenable number.

1391388 is an abundant number, since it is smaller than the sum of its proper divisors (1925604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391388 is a wasteful number, since it uses less digits than its factorization.

1391388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521 (or 2519 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1391388 is about 1179.5711084966. The cubic root of 1391388 is about 111.6390377426.

The spelling of 1391388 in words is "one million, three hundred ninety-one thousand, three hundred eighty-eight".