1011540 has 48 divisors (see below), whose sum is σ = 2959488. Its totient is φ = 257664.

The previous prime is 1011539. The next prime is 1011553. The reversal of 1011540 is 451101.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1014 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (61656).

2^1011540 is an apocalyptic number.

1011540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1479744).

1011540 is an abundant number, since it is smaller than the sum of its proper divisors (1947948).

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

1011540 is a wasteful number, since it uses less digits than its factorization.

1011540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1011540 is about 1005.7534489128. The cubic root of 1011540 is about 100.3831963963.

Adding to 1011540 its reverse (451101), we get a palindrome (1462641).

It can be divided in two parts, 1011 and 540, that added together give a palindrome (1551).

The spelling of 1011540 in words is "one million, eleven thousand, five hundred forty".