1011640 has 32 divisors (see below), whose sum is σ = 2602080. Its totient is φ = 346752.

The previous prime is 1011631. The next prime is 1011641. The reversal of 1011640 is 461101.

It is a self number, because there is not a number n which added to its sum of digits gives 1011640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1527 + ... + 2086.

It is an arithmetic number, because the mean of its divisors is an integer number (81315).

2^1011640 is an apocalyptic number.

1011640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011640 is an abundant number, since it is smaller than the sum of its proper divisors (1590440).

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

1011640 is a wasteful number, since it uses less digits than its factorization.

1011640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3631 (or 3627 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1011640 is about 1005.8031616574. The cubic root of 1011640 is about 100.3865042203.

Adding to 1011640 its reverse (461101), we get a palindrome (1472741).

The spelling of 1011640 in words is "one million, eleven thousand, six hundred forty".