1388331 has 12 divisors (see below), whose sum is σ = 2291952. Its totient is φ = 793296.

The previous prime is 1388327. The next prime is 1388353. The reversal of 1388331 is 1338831.

It is not a de Polignac number, because 1388331 - 2² = 1388327 is a prime.

It is a super-2 number, since 2×1388331² = 3854925931122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1388295 and 1388304.

It is not an unprimeable number, because it can be changed into a prime (1388381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10956 + ... + 11081.

It is an arithmetic number, because the mean of its divisors is an integer number (190996).

2^1388331 is an apocalyptic number.

1388331 is a deficient number, since it is larger than the sum of its proper divisors (903621).

1388331 is a wasteful number, since it uses less digits than its factorization.

1388331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22050 (or 22047 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1388331 is about 1178.2745859943. The cubic root of 1388331 is about 111.5572175782.

The spelling of 1388331 in words is "one million, three hundred eighty-eight thousand, three hundred thirty-one".