1040640 has 72 divisors (see below), whose sum is σ = 3335808. Its totient is φ = 276480.

The previous prime is 1040629. The next prime is 1040651. The reversal of 1040640 is 460401.

1040640 = T₃₃₁ + T₃₃₂ + ... + T₃₄₈.

It is an interprime number because it is at equal distance from previous prime (1040629) and next prime (1040651).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3705 + ... + 3975.

2^1040640 is an apocalyptic number.

1040640 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 1040640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1667904).

1040640 is an abundant number, since it is smaller than the sum of its proper divisors (2295168).

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

1040640 is an equidigital number, since it uses as much as digits as its factorization.

1040640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1040640 is about 1020.1176402749. The cubic root of 1040640 is about 101.3367188773.

The spelling of 1040640 in words is "one million, forty thousand, six hundred forty".