1131438 has 64 divisors (see below), whose sum is σ = 2949120. Its totient is φ = 280800.

The previous prime is 1131437. The next prime is 1131451. The reversal of 1131438 is 8341311.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14283 + ... + 14361.

It is an arithmetic number, because the mean of its divisors is an integer number (46080).

2^1131438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1474560).

1131438 is an abundant number, since it is smaller than the sum of its proper divisors (1817682).

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

1131438 is a wasteful number, since it uses less digits than its factorization.

1131438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133.

The product of its digits is 288, while the sum is 21.

The square root of 1131438 is about 1063.6907445306. The cubic root of 1131438 is about 104.2022076767.

Adding to 1131438 its reverse (8341311), we get a palindrome (9472749).

It can be divided in two parts, 113 and 1438, that added together give a palindrome (1551).

The spelling of 1131438 in words is "one million, one hundred thirty-one thousand, four hundred thirty-eight".