1016640 has 84 divisors (see below), whose sum is σ = 3506724. Its totient is φ = 270336.

The previous prime is 1016621. The next prime is 1016641. The reversal of 1016640 is 466101.

1016640 is a `hidden beast` number, since 1 + 0 + 1 + 664 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 389376 + 627264 = 624^2 + 792^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016641) 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, 2704 + ... + 3056.

2^1016640 is an apocalyptic number.

1016640 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 1016640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1753362).

1016640 is an abundant number, since it is smaller than the sum of its proper divisors (2490084).

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

1016640 is a wasteful number, since it uses less digits than its factorization.

1016640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1016640 is about 1008.2856738048. The cubic root of 1016640 is about 100.5516182449.

The spelling of 1016640 in words is "one million, sixteen thousand, six hundred forty".