1071640 has 32 divisors (see below), whose sum is σ = 2450880. Its totient is φ = 421632.

The previous prime is 1071601. The next prime is 1071641. The reversal of 1071640 is 461701.

It is a happy number.

It is a super-2 number, since 2×1071640² = 2296824579200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1071641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2737 + ... + 3103.

It is an arithmetic number, because the mean of its divisors is an integer number (76590).

2^1071640 is an apocalyptic number.

1071640 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 1071640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1225440).

1071640 is an abundant number, since it is smaller than the sum of its proper divisors (1379240).

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

1071640 is a wasteful number, since it uses less digits than its factorization.

1071640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1071640 is about 1035.2004636784. The cubic root of 1071640 is about 102.3331411706. Note that the first 3 decimals are identical.

It can be divided in two parts, 1071 and 640, that added together give a triangular number (1711 = T₅₈).

The spelling of 1071640 in words is "one million, seventy-one thousand, six hundred forty".