1238391 has 24 divisors (see below), whose sum is σ = 2231424. Its totient is φ = 642960.

The previous prime is 1238383. The next prime is 1238407. The reversal of 1238391 is 1938321.

It is not a de Polignac number, because 1238391 - 2³ = 1238383 is a prime.

It is a super-2 number, since 2×1238391² = 3067224537762, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201 + ... + 1586.

It is an arithmetic number, because the mean of its divisors is an integer number (92976).

2^1238391 is an apocalyptic number.

1238391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1238391 is a deficient number, since it is larger than the sum of its proper divisors (993033).

1238391 is a wasteful number, since it uses less digits than its factorization.

1238391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811 (or 1808 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1238391 is about 1112.8301757231. The cubic root of 1238391 is about 107.3872190194.

The spelling of 1238391 in words is "one million, two hundred thirty-eight thousand, three hundred ninety-one".